A bonding apparatus (8;18) for bonding a patch containing a reinforcing fiber to a bonded section on a surface portion of a corner section (CR) of an object member , the bonding apparatus (8;18) comprising: a pushing member (30;30P) configured to be disposed to push a surface of the patch in response to an application force; a biasing unit configured to be disposed to give the application force to the pushing member (30;30P); a heating unit configured to be disposed to heat the patch ; and a bag member configured to be disposed to cover the surface portion containing the bonded section of the object member , the patch , the heating unit and the pushing member (30;30P) such that an inside of the bag member can be decompressed and the application force is an atmosphere pressure that biases the pushing member (30;30P) toward a direction of the corner section (CR) through the decompressed bag member , and such that the biasing unit can be arranged outside a closed space formed from the bag member and the object member to bias the pushing member (30;30P) toward the patch , wherein the biasing unit comprises a giving member for giving the application force to the corner section (CR) and a part of the object member extending from the corner section (CR), wherein the biasing unit further comprises an inclination block and a sliding block , wherein the inclination block has a sliding slope along which the sliding block and the giving member slide, and wherein the sliding block is arranged to slide along the sliding slope to convert a clamp force (FC) in a direction different from a direction of the corner section (CR) to the application force in the direction of the corner section (CR) to transfer to the giving member . a pushing member (30;30P) configured to be disposed to push a surface of the patch in response to an application force; a biasing unit configured to be disposed to give the application force to the pushing member (30;30P); a heating unit configured to be disposed to heat the patch ; and a bag member configured to be disposed to cover the surface portion containing the bonded section of the object member , the patch , the heating unit and the pushing member (30;30P) such that an inside of the bag member can be decompressed and the application force is an atmosphere pressure that biases the pushing member (30;30P) toward a direction of the corner section (CR) through the decompressed bag member , and such that the biasing unit can be arranged outside a closed space formed from the bag member and the object member to bias the pushing member (30;30P) toward the patch , wherein the biasing unit comprises a giving member for giving the application force to the corner section (CR) and a part of the object member extending from the corner section (CR), wherein the biasing unit further comprises an inclination block and a sliding block , wherein the inclination block has a sliding slope along which the sliding block and the giving member slide, and wherein the sliding block is arranged to slide along the sliding slope to convert a clamp force (FC) in a direction different from a direction of the corner section (CR) to the application force in the direction of the corner section (CR) to transfer to the giving member . <EOS>