An electric device comprising: a housing including a device body and a cover, the device body including an adapter compartment and a battery compartment disposed at a different position from the adapter compartment, the adapter compartment being configured to accommodate an adapter (8, 108, 208, 308) including a power supply connector connectable to an external power supply, the battery compartment being configured to accommodate a battery, the cover being configured to expose and close the adapter compartment and the battery compartment; an adapter connector provided at the housing and connectable to the adapter (8, 108, 208, 308); and an output portion configured to be operated by accommodating the battery in the battery compartment or by connecting the adapter to the adapter connector and the external power supply, wherein: the housing has a general triangular shape in a side view; a manipulation portion is provided at a front surface of the housing such that the manipulation portion is sloped relative to a ground surface in a state where the electric device is placed on the ground surface, the manipulation portion being configured to be manipulated to operate the output portion; the adapter (8, 108, 208, 308) is configured to be mounted in and removed from the adapter compartment in an adapter mounting direction; the adapter compartment comprises a recessed part that is recessed in the adapter mounting direction in which the adapter is mounted, the recessed part being configured to accommodate the power supply connector of the adapter (8, 108, 208, 308); the battery is configured to be mounted in and removed from the battery compartment along a battery mounting path; the adapter compartment is disposed at a position that does not obstruct the battery mounting path; and the adapter (8, 108, 208, 308) accommodated in the adapter compartment and the adapter mounting direction are sloped relative to the ground surface in the state where the electric device is placed on the ground surface. a housing including a device body and a cover, the device body including an adapter compartment and a battery compartment disposed at a different position from the adapter compartment, the adapter compartment being configured to accommodate an adapter (8, 108, 208, 308) including a power supply connector connectable to an external power supply, the battery compartment being configured to accommodate a battery, the cover being configured to expose and close the adapter compartment and the battery compartment; an adapter connector provided at the housing and connectable to the adapter (8, 108, 208, 308); and an output portion configured to be operated by accommodating the battery in the battery compartment or by connecting the adapter to the adapter connector and the external power supply, wherein: the housing has a general triangular shape in a side view; a manipulation portion is provided at a front surface of the housing such that the manipulation portion is sloped relative to a ground surface in a state where the electric device is placed on the ground surface, the manipulation portion being configured to be manipulated to operate the output portion; the adapter (8, 108, 208, 308) is configured to be mounted in and removed from the adapter compartment in an adapter mounting direction; the adapter compartment comprises a recessed part that is recessed in the adapter mounting direction in which the adapter is mounted, the recessed part being configured to accommodate the power supply connector of the adapter (8, 108, 208, 308); the battery is configured to be mounted in and removed from the battery compartment along a battery mounting path; the adapter compartment is disposed at a position that does not obstruct the battery mounting path; and the adapter (8, 108, 208, 308) accommodated in the adapter compartment and the adapter mounting direction are sloped relative to the ground surface in the state where the electric device is placed on the ground surface. the housing has a general triangular shape in a side view; a manipulation portion is provided at a front surface of the housing such that the manipulation portion is sloped relative to a ground surface in a state where the electric device is placed on the ground surface, the manipulation portion being configured to be manipulated to operate the output portion; the adapter (8, 108, 208, 308) is configured to be mounted in and removed from the adapter compartment in an adapter mounting direction; the adapter compartment comprises a recessed part that is recessed in the adapter mounting direction in which the adapter is mounted, the recessed part being configured to accommodate the power supply connector of the adapter (8, 108, 208, 308); the battery is configured to be mounted in and removed from the battery compartment along a battery mounting path; the adapter compartment is disposed at a position that does not obstruct the battery mounting path; and the adapter (8, 108, 208, 308) accommodated in the adapter compartment and the adapter mounting direction are sloped relative to the ground surface in the state where the electric device is placed on the ground surface.