An endoscope includes an insert portion, a display portion, a manipulation portion, a casing that 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. At least a portion of a back side of the lower portion is convex. The insert portion is connected to the convex portion of the back side of the lower portion at a position such that the insert portion extends between fingers of a single hand when a user holds the lower portion. And an opening for inserting and removing the battery is provided in a back side of the upper portion.
