In Japan, eating while walking (tabearuki) is not illegal, but it is generally considered a significant social faux pas and is quietly frowned upon by locals. The cultural norm is rooted in "mindfulness" (itadakimasu) and the practical desire to avoid making a mess or bothering others in crowded public spaces. If you buy street food, the polite thing to do is to stand near the stall or find a designated seating area to finish your meal before moving on. In 2019 and into 2026, some highly touristic areas like Kamakura and Nishiki Market in Kyoto have even posted signs requesting tourists not to eat while walking to prevent litter and clothing damage in narrow alleys. While you won't be arrested or fined (unless you litter), you may receive "glares" or be perceived as a disrespectful tourist. The only common exception is at "Matsuri" (festivals), where eating while standing or walking is part of the festive atmosphere, but even then, most people prefer to find a spot to stop and savor the food.