To reduce the risk of a ruptured suture after a surgery or the like, a medical apparatus includes a biodegradable sheet in which a plurality of through-holes are formed, a value of a ratio (D/P) of a hole diameter D to a pitch P of the through-hole is in a range of 0.25 or more and less than 40. Such a medical apparatus is useful as an adhesion promoting device for promoting adhesion of biological tissue.