A charging state displaying device includes a casing, a board, a plurality of light sources, and display units. The casing includes a light blocking part. The board is mounted on the light blocking part and is accommodated in the casing. The light sources are disposed on the board so as to be separated by the board. The display units have light-permeability and are provided at positions of the casing corresponding to the light sources respectively. The board is configured to prevent leakage and mixture of lights emitted from the light sources in a cooperation with the light blocking part.