An image whose depth of field is increased is acquired without increasing a size of an apparatus. Provided is an endoscope (1) including an objective optical system (3) that is provided at a distal end of an inserted portion (2) and that acquires a subject image； an optical-path splitting means (4) that splits the subject image into two optical images that are focused differently； an imaging device (5) that acquires two images by capturing the two optical images, which are focused differently, at the same time in a state in which the two optical images are arranged on an imaging surface (5a)； and a blocking means (6) for cutting out at least abutting portions of the two optical images that are arranged on the imaging device (5), wherein conditional expression A + B >； C + D is satisfied, where A is half the maximum length of light-receiving regions for the optical images at the imaging surface (5a)； assuming that TW is an entry angle at the imaging surface (5a) when A is at the maximum image height and d is an optical-path-length difference between the two optical images, B is given by B = d × tanTW； C is half the length of the light-receiving regions in a direction in which the individual optical images formed on the imaging surface (5a) are arranged； and D is a size of a space between the two light-receiving regions.
