Webbing take-up device

When attempt is made to insert a fitting-shaft section (98) into a fitting-hole section (120) in a state where phases of the fitting-shaft section (98) of a spring-screw and the fitting-hole section (120) of an adapter (116) about a central-axis line of a spool-body (18) are not matched, shaft-section-side inclined-surfaces (104) formed at shaft-section-side protrusions abut to hole-section-side inclined-surfaces formed at hole-section-side protrusions (102), so the shaft-section-side inclined-surfaces (104) press the hole-section-side inclined-surfaces (124) in such a direction inclined in a pull-out direction to a projecting-direction of a shaft-section body from a flange section (96). The adapter (116) having received a pressing force generated by this pressing at the hole-section-side inclined-surfaces (124) has rotated in the pull-out direction, and then the phases of the fitting-hole section (120) and the fitting-shaft (98) section have aligned about the central-axis line of the spool-body (18), each shaft-section-side protrusion (102) intrudes into a gap between the hole-section-side protrusions (124) adjacent to each other, and the fitting-shaft section (98) fits into the fitting-hole section (120).