To achieve a body-insertable apparatus such as a capsule endoscope that moves in a subject at a low speed at which acquisition of in-vivo information is sufficiently possible, the body-insertable apparatus is inserted into the subject and moves in the subject. The body-insertable apparatus includes an in-vivo information acquiring unit that acquires the in-vivo information, an external case member accommodating the in-vivo information acquiring unit, and a moving-speed suppressing unit positioned inside or outside of the external case member to generate a predetermined suppressing force for suppressing the moving speed between an inner wall of a passage route in the subject and the external case member.
