A gas turbine combustor, comprising: a combustor swirler basket; a pilot burner disposed in a center of the combustor swirler basket; a plurality of main burners disposed radially outside the pilot burner along a circumferential direction of an inner peripheral surface of the combustor swirler basket; a base plate disposed inside the combustor swirler basket and supporting the pilot burner and the main burners; a bolt; and a bolt receiving portion protruding radially inward from the inner peripheral surface and engaged with the base plate, wherein the base plate has an upstream surface disposed upstream in a direction of flow of compressed air to be supplied to the combustor swirler basket, and a downstream surface, wherein a downstream end portion of the bolt receiving portion has a cross section curving in such a streamlined shape along the direction of the flow of the compressed air to gradually narrow as extending downstream in the direction of the flow, wherein the downstream surface of the base plate engages with an end surface of the bolt receiving portion, and wherein the base plate and the bolt receiving portion are fixed to each other with the bolt inserted from the upstream surface side. a combustor swirler basket; a pilot burner disposed in a center of the combustor swirler basket; a plurality of main burners disposed radially outside the pilot burner along a circumferential direction of an inner peripheral surface of the combustor swirler basket; a base plate disposed inside the combustor swirler basket and supporting the pilot burner and the main burners; a pilot burner disposed in a center of the combustor swirler basket; a plurality of main burners disposed radially outside the pilot burner along a circumferential direction of an inner peripheral surface of the combustor swirler basket; a base plate disposed inside the combustor swirler basket and supporting the pilot burner and the main burners; a bolt; and a bolt receiving portion protruding radially inward from the inner peripheral surface and engaged with the base plate, wherein the base plate has an upstream surface disposed upstream in a direction of flow of compressed air to be supplied to the combustor swirler basket, and a downstream surface, wherein a downstream end portion of the bolt receiving portion has a cross section curving in such a streamlined shape along the direction of the flow of the compressed air to gradually narrow as extending downstream in the direction of the flow, wherein the downstream surface of the base plate engages with an end surface of the bolt receiving portion, and wherein the base plate and the bolt receiving portion are fixed to each other with the bolt inserted from the upstream surface side. a bolt receiving portion protruding radially inward from the inner peripheral surface and engaged with the base plate, wherein the base plate has an upstream surface disposed upstream in a direction of flow of compressed air to be supplied to the combustor swirler basket, and a downstream surface, wherein a downstream end portion of the bolt receiving portion has a cross section curving in such a streamlined shape along the direction of the flow of the compressed air to gradually narrow as extending downstream in the direction of the flow, wherein the downstream surface of the base plate engages with an end surface of the bolt receiving portion, and wherein the base plate and the bolt receiving portion are fixed to each other with the bolt inserted from the upstream surface side.