In a syringe (10A) constituting a prefilled syringe (12A), when a cap body (42a) is attached to a cylindrical portion (24a), a first sealing section (56) is compressed radially inward by an inner peripheral surface constituting an opening (30) of the cylindrical portion (24a), thereby sealing a distal end section of a flow path (32) in a liquid-tight manner, and a second sealing section (58a) is compressed radially inward by an inner peripheral surface of a proximal end section (36) of the cylindrical portion (24a), thereby sealing a proximal end section of the flow path (32) in a liquid-tight manner.
