A spinning reel, comprising: a spool supported by a reel body for winding a fishing line thereon, and a switching mechanism for switching between the state where the rotation of the spool shaft is restricted and the state where the rotation of the spool shaft is permitted, the switching mechanism, comprising: a shaft member (40,) extending in a left-right direction and supported by the reel body so as to be rotatable around a shaft member central axis, the shaft member having a right end portion and a left end portion which both project further than the reel body, in the left-right direction, and a clutch lever mounted on opposite end portions of the shaft member and capable of rotational operation, having a right fitting portion and a left fitting portion, wherein the right end portion and the left end portion are fitted into the right fitting portion and the left fitting portion, respectively wherein the shaft member is rotatable around the shaft central axis, for operating the switching mechanism, by rotational operation of the clutch lever; a fastener which penetrates one of the fitting portions (53,) and threadably engages with one of the end portions, wherein an outer peripheral surface of the right end portion (41, 41A, 41B) has flat surfaces (41A, 41B) facing in opposite directions, and an outer peripheral surface of the left end portion has flat surfaces (42A, 42B) facing in opposite directions, such that the right end portion and the left end portion have a generally non-circular shape as viewed from a side, both end portions engaging into a complementary shape of the respective fitting portions and, characterized in that the fastener extends in a direction orthogonal to the central axis of the shaft member and threadably engages with the end portion of the shaft member and squeezes, thereby fixing tightly together, the shaft portion and the fitting portion in a direction orthogonal to the shaft member central axis. a spool supported by a reel body for winding a fishing line thereon, and a switching mechanism for switching between the state where the rotation of the spool shaft is restricted and the state where the rotation of the spool shaft is permitted, the switching mechanism, comprising: a shaft member (40,) extending in a left-right direction and supported by the reel body so as to be rotatable around a shaft member central axis, the shaft member having a right end portion and a left end portion which both project further than the reel body, in the left-right direction, and a clutch lever mounted on opposite end portions of the shaft member and capable of rotational operation, having a right fitting portion and a left fitting portion, wherein the right end portion and the left end portion are fitted into the right fitting portion and the left fitting portion, respectively wherein the shaft member is rotatable around the shaft central axis, for operating the switching mechanism, by rotational operation of the clutch lever; a fastener which penetrates one of the fitting portions (53,) and threadably engages with one of the end portions, wherein an outer peripheral surface of the right end portion (41, 41A, 41B) has flat surfaces (41A, 41B) facing in opposite directions, and an outer peripheral surface of the left end portion has flat surfaces (42A, 42B) facing in opposite directions, such that the right end portion and the left end portion have a generally non-circular shape as viewed from a side, both end portions engaging into a complementary shape of the respective fitting portions and, characterized in that a shaft member (40,) extending in a left-right direction and supported by the reel body so as to be rotatable around a shaft member central axis, the shaft member having a right end portion and a left end portion which both project further than the reel body, in the left-right direction, and a clutch lever mounted on opposite end portions of the shaft member and capable of rotational operation, having a right fitting portion and a left fitting portion, wherein the right end portion and the left end portion are fitted into the right fitting portion and the left fitting portion, respectively wherein the shaft member is rotatable around the shaft central axis, for operating the switching mechanism, by rotational operation of the clutch lever; a fastener which penetrates one of the fitting portions (53,) and threadably engages with one of the end portions, wherein an outer peripheral surface of the right end portion (41, 41A, 41B) has flat surfaces (41A, 41B) facing in opposite directions, and an outer peripheral surface of the left end portion has flat surfaces (42A, 42B) facing in opposite directions, such that the right end portion and the left end portion have a generally non-circular shape as viewed from a side, both end portions engaging into a complementary shape of the respective fitting portions and, characterized in that the fastener extends in a direction orthogonal to the central axis of the shaft member and threadably engages with the end portion of the shaft member and squeezes, thereby fixing tightly together, the shaft portion and the fitting portion in a direction orthogonal to the shaft member central axis.