Do I need to bring an adapter to travel to Japan?

Yes, mainly because the plug is not suitable, or the plug can't be inserted. The voltage in Japan is 1 10V, and in China it is 220V. Therefore, it is no problem for your mobile phone charger or double-headed socket to be directly plugged into the power supply of 1 10V, and it will not burn out. You need a converter, because mobile phone chargers can't be charged, and many things, such as SLR, mobile wifi, charging treasure and pad, may need to be charged. At this time, you must use the patch panel, because there are not so many power plugs in general hotels, and the domestic patch panels are basically three-headed, which does not match the Japanese standard three-headed socket, so you need a converter.