An electronic apparatus includes: a case body having a battery storing portion formed of a concave portion whose shape is approximately corresponding to an external shape of a battery unit and a sliding member slidably supported on a surface of the case body on the opposite side to the battery storing portion. The battery storing portion has a width corresponding to that of the battery unit, a length corresponding to a length of the battery unit, and a body-side connection terminal connected to a connection terminal of the battery unit. The sliding member includes one or more engagement claws penetrating through the case body, projecting to the inside of the battery storing portion, capable of being engaged with engagement convex portions provided in the battery unit, and a biasing member causing the claws to be biased away from the body-side connection terminal and engaged with the engagement convex portions.