An endoscope includes an insert portion, a display portion, a manipulation portion, a casing which houses the display portion and the manipulation portion at a front side, and to which the insert portion is connected at a back side, and a battery. The casing has an upper portion in which the display portion is housed and a lower portion in which the manipulation portion is housed. The insert portion is connected to the lower portion and extends from the lower portion in a first direction. And a line connecting a center of gravity of the battery and a center of gravity of the casing while the battery is housed in the casing extends in a second direction that intersects the first direction at an angle.
