A battery holder includes a first base, a first holding portion and a second holding portion. The first base is opposed to a first end of the battery unit in the state in which the battery unit is located at a first holding position. The first holding portion is movably arranged on the first base between a first position, where the first holding portion contacts a held portion of the battery unit to hold the battery unit at the first holding position, and a second position, where the first holding portion is separated from the held portion. The second holding portion is arranged on the first base at a downstream side of the first holding portion in a removal direction of the battery unit from the battery holder to hold the battery unit at a second holding position that is located at a downstream side of the first holding position.