A rotatable connector device, comprising: a stator fixed to a fixed body; a rotator which is attached to the stator so as to be rotatable with respect to the stator both leftward and rightward and is rotatable along with a rotation of a rotatable operation tool fit to a fitting hole at a center of the rotator; and a provisional fixing mechanism for provisionally fixing the rotator at a neutral position on the stator; wherein: the provisional fixing mechanism has a center hole for receiving a rotation shaft rotatable by the rotatable operation tool and is fixed to a bottom part of the rotator so as to be non-rotatable with respect to the rotator, and puts engaging parts, of an engaging member moved upward by an urging force of a spring member built in the provisional fixing mechanism in a state of surrounding the center hole, into engagement with engageable parts of the stator to provide provisional fixation; and the engaging parts and the engageable parts are located at one neutral position at which the rotator is at the neutral position when the engaging parts and the engageable parts are engaged with each other, and at an opposite position opposite to the one neutral position with respect to a center point of the center hole; charaterized in that in the vicinity of a spring contact face of the engaging member that is contactable with a top end of the spring member, regulation means for regulating the position of the top end of the spring member is provided, wherein the regulation means is a fitting groove for allowing the top end of the spring member to be fit thereto. a stator fixed to a fixed body; a rotator which is attached to the stator so as to be rotatable with respect to the stator both leftward and rightward and is rotatable along with a rotation of a rotatable operation tool fit to a fitting hole at a center of the rotator; and a provisional fixing mechanism for provisionally fixing the rotator at a neutral position on the stator; wherein: the provisional fixing mechanism has a center hole for receiving a rotation shaft rotatable by the rotatable operation tool and is fixed to a bottom part of the rotator so as to be non-rotatable with respect to the rotator, and puts engaging parts, of an engaging member moved upward by an urging force of a spring member built in the provisional fixing mechanism in a state of surrounding the center hole, into engagement with engageable parts of the stator to provide provisional fixation; and the engaging parts and the engageable parts are located at one neutral position at which the rotator is at the neutral position when the engaging parts and the engageable parts are engaged with each other, and at an opposite position opposite to the one neutral position with respect to a center point of the center hole; charaterized in that in the vicinity of a spring contact face of the engaging member that is contactable with a top end of the spring member, regulation means for regulating the position of the top end of the spring member is provided, wherein the regulation means is a fitting groove for allowing the top end of the spring member to be fit thereto. the provisional fixing mechanism has a center hole for receiving a rotation shaft rotatable by the rotatable operation tool and is fixed to a bottom part of the rotator so as to be non-rotatable with respect to the rotator, and puts engaging parts, of an engaging member moved upward by an urging force of a spring member built in the provisional fixing mechanism in a state of surrounding the center hole, into engagement with engageable parts of the stator to provide provisional fixation; and the engaging parts and the engageable parts are located at one neutral position at which the rotator is at the neutral position when the engaging parts and the engageable parts are engaged with each other, and at an opposite position opposite to the one neutral position with respect to a center point of the center hole; charaterized in that in the vicinity of a spring contact face of the engaging member that is contactable with a top end of the spring member, regulation means for regulating the position of the top end of the spring member is provided, wherein the regulation means is a fitting groove for allowing the top end of the spring member to be fit thereto.