To provide a fuel container, a power generator and an electronic apparatus, capable of detecting a residual amount of fuel in a simple structure.

There are included housings 201 and 202 which are installed so as to face light-emitting and light-receiving elements 321 and 322 with respect to a body 101 having a surface on which the light-emitting and light-receiving elements 321 and 322 are arranged, and store fuel 207 therein; and a movable body 203 which moves in an array direction of the light-emitting and light-receiving elements 321 and 322 according to the capacity of the fuel 207 in the housings 201 and 202, wherein a window member 202 for transmitting light emitted from the light-emitting element 321 is disposed in a portion opposed to the light-emitting and light-receiving elements 321 and 322 of the housings 201 and 202.