[Problem to be solved] To provide a spool attachment mechanism for fishing reel, which is capable of making the length in spool shaft direction of the fishing reel as short as possible. [Technical content] The spool attachment mechanism (6) is capable of attaching/detaching the spool shaft (2) to/from the spool (3) in a single-touch manner. The spool attachment mechanism (6) includes a first bearing (4) used as a protrusion part, an attachment member (30), a pressing member (32) and a cover member (34) used as a positioning member. The first bearing (4) has a first side surface (4c) and a second side surface (4d). The attachment member (30) has a restraining part (40) and a press operation part (42). The restraining part (40) and the second side surface (4d) face to each other. The attachment member is movable in a radial direction between the restraining position of the restraining part (40) that faces the second side surface (4d) and the far-away position that is far away from the first bearing (4). The pressing member (32) presses the attachment member (30) toward the restraining position. The cover member (34) is used to position the attachment member, which is pressed toward the restraining position, at the restraining position.
