To enhance reliability in power supply and provide good workability in battery inserting and removing.

This battery housing structure has an equipment housing body 2, having a battery housing 66 for housing a battery B which is energized to a fixed terminal with a spring terminal 65, and a battery housing cover 63 which is fit to the equipment housing body 2 and opens and closes the battery housing 66, and a locking piece 4 for locking/unlocking the battery housing cover 63 is fit to the equipment housing body 2 to be capable of reciprocating, a battery accepting piece 10 for regulating the movement in the battery axial line direction to the spring terminal side of the battery B within the battery housing 66 is installed in the locking piece 4, and the battery accepting piece 10 is displaced between the battery movement regulating position and the battery non-movement regulating position by the reciprocation of the locking piece 4.