A compression device (1, 101, 201, 251, 301, 401, 501, 601, 701, 801, 901) for performing hemostasis on a puncture site comprising: an adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) including an adhesion surface (11, 311, 411, 511, 611, 711, 811), which is adherable to a biological surface, on one side of a thickness direction; and a compression member that is mounted on the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) to be configured to compress the biological surface, wherein the compression member (3, 103, 203, 253, 303, 403, 503, 603, 703, 803, 903) includes a fixing portion that is fixed to the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) on the other side which is an opposite side of the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) from the adhesion surface (11, 311, 411, 511, 611, 711, 811) in the thickness direction, and a compression main body portion that is provided in a portion of the compression member (3, 103, 203, 253, 303, 403, 503, 603, 703, 803, 903), in a plan view seen along the thickness direction, the compression main body portion not overlapping the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902), to protrude or to be protrusible further toward the one side in the thickness direction than the adhesion surface (11, 311, 411, 511, 611, 711, 811) of the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902), wherein the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) includes a first portion to which the fixing portion is fixed and a second portion to which the fixing portion is not fixed, and wherein the second portion is provided on at least a compression main body portion side of the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902), wherein the compression member (3, 103, 203, 253, 303, 403, 503, 603, 703, 803, 903) includes an expander (21, 121, 221, 271, 321, 421, 521, 621, 721, 921) that is expandable toward the one side of the thickness direction and a holder (22, 122, 222, 272, 322, 422, 522, 622, 722) that holds the expander (21, 121, 221, 271, 321, 421, 521, 621, 721, 921), and the compression main body portion includes the expander (21, 121, 221, 271, 321, 421, 521, 621, 721, 921) and the holder (22, 122, 222, 272, 322, 422, 522, 622, 722), characterized in that the holder (22, 122, 222, 272, 322, 422, 522, 622, 722) possesses a receiving opening portion configured to receive a medical device configured to be inserted into a patient's body, the receiving opening portion is formed of a slit (15, 315, 902a) of the adhesion sheet, a gap (25a, 125a, 225a, 325a, 903a) formed by the compression member, and a part of a central opening region defined by both the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) and the compression member. an adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) including an adhesion surface (11, 311, 411, 511, 611, 711, 811), which is adherable to a biological surface, on one side of a thickness direction; and a compression member that is mounted on the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) to be configured to compress the biological surface, wherein the compression member (3, 103, 203, 253, 303, 403, 503, 603, 703, 803, 903) includes a fixing portion that is fixed to the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) on the other side which is an opposite side of the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) from the adhesion surface (11, 311, 411, 511, 611, 711, 811) in the thickness direction, and a compression main body portion that is provided in a portion of the compression member (3, 103, 203, 253, 303, 403, 503, 603, 703, 803, 903), in a plan view seen along the thickness direction, the compression main body portion not overlapping the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902), to protrude or to be protrusible further toward the one side in the thickness direction than the adhesion surface (11, 311, 411, 511, 611, 711, 811) of the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902), wherein the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) includes a first portion to which the fixing portion is fixed and a second portion to which the fixing portion is not fixed, and wherein the second portion is provided on at least a compression main body portion side of the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902), wherein the compression member (3, 103, 203, 253, 303, 403, 503, 603, 703, 803, 903) includes an expander (21, 121, 221, 271, 321, 421, 521, 621, 721, 921) that is expandable toward the one side of the thickness direction and a holder (22, 122, 222, 272, 322, 422, 522, 622, 722) that holds the expander (21, 121, 221, 271, 321, 421, 521, 621, 721, 921), and the compression main body portion includes the expander (21, 121, 221, 271, 321, 421, 521, 621, 721, 921) and the holder (22, 122, 222, 272, 322, 422, 522, 622, 722), characterized in that the holder (22, 122, 222, 272, 322, 422, 522, 622, 722) possesses a receiving opening portion configured to receive a medical device configured to be inserted into a patient's body, the receiving opening portion is formed of a slit (15, 315, 902a) of the adhesion sheet, a gap (25a, 125a, 225a, 325a, 903a) formed by the compression member, and a part of a central opening region defined by both the adhesion sheet (2, 302, 402, 502, 602, 702, 802, 902) and the compression member.