Waterproof slide fastener

The waterproof slide fastener includes a slider and a slider stopper member. A flange portion of the slider includes a linear portion extending linearly from a rear mouth and a curved portion extending to curve outward from an end part of the linear portion. The slider stopper member includes an insertion base portion disposed across right and left waterproof tapes, right and left insertion leg portions extending from the insertion base portion toward element rows, and flange press contact portions disposed on outer side surfaces of the respective insertion leg portions, wherein the flange press contact portion includes a press contact curved portion and a press contact straight portion extending linearly from a rear end part of the press contact curved portion. Thereby, even when the slider is held at a sliding limit vicinity position away from a sliding limit position, watertightness can be exerted.