Provided is a hemostatic device (100) capable of effectively applying a compressive force to a puncture site (p1 to p4) formed at a predetermined position avoiding a metacarpal bone (B1) of an index finger of a hand (H) and a metacarpal bone (B2) of a thumb of the hand even when hemostasis is performed on the puncture site (p1 to p4) . The hemostatic device (100) includes a support member (110) configured to cover the first puncture site (p1), a securing member (120) configured to secure the support member (110) to the first puncture site (p1), and an inflatable member (180) connected to the support member (110) and configured to compress the first puncture site (p1). The support member (110) has rigidity higher than rigidity of the inflatable member (180). A width (W) of the support member (110) becomes shorter from an upper end portion (111) toward a lower end portion (112). A thickness of a side surface portion (113) of the support member (110) becomes thinner from the upper end portion (111) toward the lower end portion (112).