A sheet fastener (1, 1A, 1B) for fastening a pair of sheet edges (8, 9) continuously along the sheet edges, comprising: a first member (10, 10A, 10B); and a second member (20, 20A, 20B) to be inserted into the first member (10, 10A, 10B), each of the first member and the second member being provided by a continuous member having a predetermined cross section, wherein the first member (10, 10A, 10B) comprises a first fixing portion on which one of the sheet edges is fixed and a holder (12, 12A, 12B) continuous with the first fixing portion, the holder (12, 12A, 12B) comprises a first recess and a support portion formed opposite the first fixing portion across an opening of the first recess, the second member (20, 20A, 20B) comprises a second fixing portion (21, 21B) on which the other of the sheet edges is fixed and a head (22, 22A) continuous with the second fixing portion (21, 21B), and the support portion is configured to be brought into contact with a surface of the second fixing portion (21, 21B) when the head (22, 22A) of the second member (20, 20A, 20B,) is inserted into the first recess of the first member (10, 10A, 10B,), wherein the head (22, 22A) comprises a held portion (22, 22A) continuous with the second fixing portion (21, 21B) and a second recess that is defined in the held portion (22, 22A) and includes an opening engageable with the support portion, characterized in that the second member (20, 20A, 20B) comprises a contact portion formed along an opening edge of the held portion (22, 22A) near the second fixing portion (21, 21B), the contact portion and the support portion are configured such that the contact portion is brought into contact with a lateral surface of the support portion and, simultaneously, a tip end of the support portion is brought into contact with an inner surface of the held portion (22, 22A), when the support portion is inserted into the held portion (22, 22A), and the support portion is configured to be brought into contact with the surface of the second fixing portion (21, 21B) when the held portion (22, 22A) of the second member (20, 20A, 20B) is inserted into the first recess. a first member (10, 10A, 10B); and a second member (20, 20A, 20B) to be inserted into the first member (10, 10A, 10B), each of the first member and the second member being provided by a continuous member having a predetermined cross section, wherein the first member (10, 10A, 10B) comprises a first fixing portion on which one of the sheet edges is fixed and a holder (12, 12A, 12B) continuous with the first fixing portion, the holder (12, 12A, 12B) comprises a first recess and a support portion formed opposite the first fixing portion across an opening of the first recess, the second member (20, 20A, 20B) comprises a second fixing portion (21, 21B) on which the other of the sheet edges is fixed and a head (22, 22A) continuous with the second fixing portion (21, 21B), and the support portion is configured to be brought into contact with a surface of the second fixing portion (21, 21B) when the head (22, 22A) of the second member (20, 20A, 20B,) is inserted into the first recess of the first member (10, 10A, 10B,), wherein the head (22, 22A) comprises a held portion (22, 22A) continuous with the second fixing portion (21, 21B) and a second recess that is defined in the held portion (22, 22A) and includes an opening engageable with the support portion, characterized in that the second member (20, 20A, 20B) comprises a contact portion formed along an opening edge of the held portion (22, 22A) near the second fixing portion (21, 21B), the contact portion and the support portion are configured such that the contact portion is brought into contact with a lateral surface of the support portion and, simultaneously, a tip end of the support portion is brought into contact with an inner surface of the held portion (22, 22A), when the support portion is inserted into the held portion (22, 22A), and the support portion is configured to be brought into contact with the surface of the second fixing portion (21, 21B) when the held portion (22, 22A) of the second member (20, 20A, 20B) is inserted into the first recess.