Which button flushes a smart toilet in Japan?

Look for the Chinese characters '大' (Dai - Big/Full Flush for solid waste) and '小' (Shou - Small/Eco Flush for liquid). On modern sensor toilets, wave your hand over the black optical sensor labeled '手をかざす' (Hold hand over).

Should I throw used toilet paper in the trash bin or toilet in Japan?

Always flush toilet paper down the toilet bowl! Japanese plumbing and water-dissolving toilet papers are engineered to prevent clogs. The small countertop or wall bin is strictly for feminine sanitary products.

What does the 'Otohime' (音姫) musical note button do?

Otohime (Sound Princess) plays an electronic loop of rushing water sounds or gentle bird chirping to provide acoustic privacy. It does NOT flush the toilet—it only plays sound.

Are squat toilets still common in Japan?

Traditional Japanese squat toilets (和式 - Washiki) are increasingly rare, found mostly in older train stations, rural parks, or historic temples. Modern buildings, airports, and hotels feature 100% Western-style smart toilets (洋式 - Youshiki).

Japan Smart Toilet Washlet Guide: Symbols & Etiquette (2026)

From bullet train stations and luxury hotel suites to humble 7-Eleven convenience stores, Japanese electronic smart toilets (often called TOTO Washlets) are a global symbol of technological comfort: heated seats, oscillating bidet wands, warm-air dryers, and automatic deodorizers.

However, confronting a futuristic 12-button wall panel labeled in Japanese kanji can feel overwhelming for first-time visitors.

This verified 2026 guide decodes all standardized Washlet pictograms, flush sensor types, acoustic privacy features (Otohime), and essential bathroom etiquette.

1. The 8 Standardized Japanese Washlet Symbols (JIS Pictograms)

In 2017, Japan’s top sanitary manufacturers (TOTO, LIXIL, Panasonic, Toshiba) standardized control panel icons into a unified set of pictograms:

flowchart TD
    Panel[Smart Toilet Control Panel] --> MainFunctions{Select Desired Function}
    
    MainFunctions -->|Rear Clean 🔵| Rear[おしり Oshiri: Standard rear bidet spray]
    MainFunctions -->|Front / Bidet 🌸| Bidet[ビデ Bide: Gentle feminine front wash]
    MainFunctions -->|Stop ⏹️| Stop[止 / 停止: Instantly cuts off water spray]
    MainFunctions -->|Dryer 💨| Dry[乾燥 Kansou: Warm-air drying blower]
    MainFunctions -->|Sound Mask 🎵| Oto[音姫 Otohime: Plays water noise for privacy]

Symbol & Japanese Label	Romaji	Meaning & Function	Operation Tip
⏹️ 止 / 停止	Tomaru	STOP	Instantly halts all water spraying, wand oscillation, and air drying
🔵 おしり	Oshiri	Rear Bidet Wash	Extends nozzle to spray targeted warm water stream for rear cleaning
🌸 ビデ	Bide	Front Feminine Wash	Wider, softer dispersed water spray designed for women
💨 乾燥	Kansou	Warm Air Dryer	Blows gentle heated air to dry skin after washing
🌊 大	Dai	Large Flush (Full)	High-volume flush for solid waste
💧 小	Shou	Small Flush (Eco)	Low-volume eco flush for liquid waste
🎵 音姫	Otohime	Sound Princess	Plays acoustic water noise; does NOT flush real water
↔️ 水勢 / 位置	Suisei / Ichi	Water Pressure / Nozzle Position	Adjusts spray strength (+ / -) and moves wand forward/backward

2. Finding the Flush: 3 Common Mechanisms

International travelers frequently get stuck searching for how to flush:

classDiagram
    class FlushTypes {
        +Type_1 "Wall Button: Look for 大 (Full) and 小 (Eco) buttons on main keypad"
        +Type_2 "Infrared Sensor: Black panel with 手をかざす - Wave palm 2cm away"
        +Type_3 "Tank Handle: Traditional silver lever on right side of porcelain tank"
    }

Top of Wall Keypad: Look above the main bidet buttons for prominent silver/white buttons labeled 「大」 and 「小」.
Optical Motion Sensor (手をかざす): A rectangular black sensor mounted on the stall wall. Hover your open palm 2 to 3 cm in front of the flashing red/green LED sensor for 1 second.
Automatic Sensor (自動洗浄): High-end models automatically detect when you stand up from the seat and flush after a 3-second delay.

3. Essential Bathroom Etiquette in Japan

A. Toilet Paper Disposal Rule (NEVER Use the Trash Can)

Flush All Toilet Paper: Japanese toilet paper is thin, single/double-ply 100% water-soluble wood pulp designed to dissolve within seconds. Always flush used toilet paper down the bowl.
The Small Sanitary Bin (サニタリーボックス): The small pedal-operated bin next to the toilet is STRICTLY for feminine hygiene products (tampons/pads). Throwing toilet paper or food trash into this bin is considered unhygienic and disrespectful to housekeeping staff.

B. Japanese Bathroom Slippers (トイレ用スリッパ)

When entering a traditional ryokan, izakaya with tatami mats, or private home:

Step out of your indoor room slippers at the bathroom threshold.
Step directly into the dedicated toilet slippers (labeled トイレ / TOILET).
[!CAUTION] Remember to switch back! Forgetting to change out of toilet slippers and walking back onto clean tatami mats in the dining area is the #1 cultural faux pas committed by tourists.

4. Troubleshooting: What if the Toilet Beeps or Won’t Spray?

Sit Down Firmly: Smart toilets have built-in occupancy weight sensors inside the seat rim. Bidet functions will not spray unless a passenger is actively seated (preventing accidental spraying onto walls).
Emergency Button Trap (非常ボタン): In public restrooms, be careful not to press the red 「非常 (Emergency Call)」 button, which summons train station security officers. The flush button is labeled 「流す (Flush)」.