An electronic apparatus includes: a housing having an internal space formed by top, bottom and side plates; and a power-source housing section formed next to a part of the side plate in the internal space and having a plate wall shaped such that a part adjacent to the side plate is near the side plate on one side and is away from the side plate on the other side in a direction connecting the top plate with the bottom plate. The apparatus further includes: a power-source block having an outer wall-surface whose shape conforms to the plate wall and housed in the power-source housing section; an antenna disposed in a space between the side plate and the plate wall; and a circuit board disposed in the internal space and mounted with an electronic circuit that operates based on power supplied from the power-source block housed in the power-source housing section.