Nut, fishing rod reel seat, and fishing rod

A nut for moving a hood main body of a movable hood by being screwed with a male screw portion of a reel seat main body with a reel leg placing portion on which a reel leg is placed, the nut comprising:

• a nut base portion which has an outer peripheral surface with a protrusion portion and an inner peripheral surface with a female screw portion for movement by being screwed into the male screw portion of the reel seat main body, and of which an end portion is locked to the hood main body;
• and
• a cylindrical portion that has at least one recessed portion engaged with the protrusion portion such that the cylindrical portion is fixed on an outside of the nut base portion, wherein
• in a state where the second recessed portion is engaged with the first protrusion portion, the nut base portion is press-fitted and fixed in a circumferential direction and a radial direction of the nut base portion by the cylindrical portion,
• the cylinder portion has a plurality of groove portions that extend in a central axis direction of the cylinder portion and are on an inner peripheral surface of the cylinder portion, and each of the groove portions includes one of the recessed portion, and
• each of the groove portions comprises, in order from a side of opposite to the hood main body, a base portion, an inclined portion, a top portion, and the recessed portion, which is recessed relative to the top portion, and
• the top portion is a radially inner-most surface of the groove portion that is axially in line with the base portion, the inclined portion and the recessed portion.