Slider and slide fastener

A slider comprising:

• a body;
• a pull tab;
• and a cover body, wherein
• a side of the slider on which the pull tab is present is referred to as an upper side and an opposite side thereof is referred to as a lower side, when the slider is installed to a fastener chain, a direction in which the slider is slid to mesh left and right continuous element rows is referred to as a front side and a direction in which the slider is slid to separate the left and right continuous element rows is referred to as a rear side, and when the slider is viewed from the upper side, a left side in a front-rear direction is referred to as a left side and an opposite side thereof is referred to as a right side,
• the body includes an upper blade, a lower blade installed at a prescribed interval on the lower side of the upper blade, a guide column coupling the upper blade and the lower blade on the front side, and a first column portion protruding toward the upper side from a front portion of an upper surface of the upper blade, and a second column portion protruding toward the upper side from a rear portion of the upper surface of the upper blade,
• the first column portion includes a pair of first facing walls arranged side by side in a left-right direction,
• the second column portion includes a pair of second facing walls arranged side by side in the left-right direction,
• the pull tab includes a pivot installed between the first column portion and the second column portion,
• the cover body includes:
• an upper wall portion covering the first column portion, the second column portion, and the pivot;
• curved portions respectively curved and extending from the upper wall portion toward the front side and the lower side, and toward the rear side and the lower side;
• support portions extending from the respective curved portions toward the lower side and supported by the first column portion and the second column portion;
• and extending portions extending toward the lower side from the upper wall portion,
• the extending portions each include two abutting portions extending toward the lower side respectively from the front side and the rear side of the upper wall portion,
• the pair of the first facing walls each include a first abutted portion facing the abutting portion and a first facing wall upper surface portion facing a lower surface of the upper wall portion,
• the pair of second facing walls each include a second abutted portion facing the abutting portion and a second facing wall upper surface portion facing the lower surface of the upper wall portion,
• in a section orthogonal to the front-rear direction,
• at least a part of a gap between the abutting portion and the first abutted portion is smaller than a gap between the lower surface of the upper wall portion and the first facing wall upper surface portion, and
• at least a part of a gap between the abutting portion and the second abutted portion is smaller than a gap between the lower surface of the upper wall portion and the second facing wall upper surface portion.