The present invention provides a resin-made slider of the type that a pull tab is to be attached afterward, wherein a cantilever pull tab attaching lever is provided from a rear mouth side of an upper blade toward a shoulder mouth and has an engaging portion at a front end portion thereof, an engaged portion is provided on the shoulder mouth of the body so that the engaging and engaged portions can be engaged with each other, a concave portion is provided in the upper blade from a proximal portion toward the shoulder mouth, a gap portion is formed between the upper blade and the proximal portion, and the gap portion allows to form in the upper blade a first upper blade portion separated from the proximal portion and a second upper blade portion disposed from the proximal portion toward the shoulder mouth side and connected to the proximal portion.