An object of the present invention is to make it possible to easily attach a sound producing mechanism to a spool of a spinning reel and to compactly dispose the spool. An annular attachment member to which a hitting member of a sound producing mechanism is attached is detachably/reattachably mounted and fixed in an attachment recess that is formed to be annularly concaved in an inner peripheral portion of a bobbin trunk. Here, the annular attachment member is completely mounted in the attachment recess that is formed to be annularly concaved. Accordingly, it is possible to easily attach the attachment member to the attachment recess, and it is also possible to uniformly maintain the weight balance of a spool in the peripheral direction. In addition, here, the attachment member is mounted in the attachment recess. Thus, the attachment member is not likely to protrude backward from a rear end portion of the bobbin trunk, compared to the conventional configuration. Accordingly, it is possible to compactly dispose the spool.