BATTERY PACK, ELECTRICAL DEVICE, AND ELECTRICAL DEVICE MAIN BODY

A battery pack includes: a first case having a slot portion exposing a battery-side terminal portion and a guide portion guiding attachment to an electrical device main body; a second case defining a space accommodating a battery cell by being joined with the first case; a separator holding the battery cell; a circuit board fixed to a side of the separator facing the first case; and the battery-side terminal portion is fixed at a position corresponding to the slot portion of the circuit board and connectable to a main body side terminal of an electrical device main body. The separator has a connecting portion provided around the circuit board when viewed from above, at a position facing the first case, and the first case has a connected portion connected to the connecting portion at a portion corresponding to the connecting portion.