Method of manufacturing surface fastener

A method of manufacturing a surface fastener made of synthetic resin, the surface fastener including a base part and a plurality of engaging elements, the base part having a first surface and a second surface that are located opposite each other, the engaging elements each including a stem portion and an engaging head, the stem portion projecting in a thickness direction from the first surface of the base part, the engaging head formed integrally with a distal end of the stem portion, the engaging head having a shape that spreads outwardly in a direction orthogonal to the thickness direction to the distal end of the stem portion, wherein the method comprises:

• a molding step of molding a pre-fastener body from the synthetic resin that is melted, the pre-fastener body including the plurality of engaging elements;
• and
• a thickness-adjusting step of adjusting, after the molding step, a thickness dimension of the surface fastener by pressing the pre-fastener body or a deformed fastener body in which at least a portion of the pre-fastener body is subject to at least once deformation process, in the thickness direction to decrease the thickness dimension of at least a portion of the pre-fastener body or the deformed fastener body,
• wherein, when a direction orthogonal to a machining direction of the thickness-adjusting step is defined as a cross direction, the thickness-adjusting step includes making difference of reduction amounts of the stem portions in a thickness dimension between at least two of the engaging elements by applying respectively different pressing forces to the at least two engaging elements, the at least two engaging elements being located at different positions each other of the pre-fastener body or the deformed fastener body in the cross direction.