A waterproof slide fastener comprising: a pair of tapes (224, 323a, 324b) having: a plurality of coupling elements (220, 320a, 320b) attached to one side of each of the pair of tapes; and a coating (242, 322a, 322b) of polymeric maternal provided on the other side of each of the pair of tapes (224, 323a, 324b), and extending continuously along a longitudinal direction of the pair of tapes (224, 323a, 324b), wherein when the waterproof slide fastener is in an open state, in a cross-section taken along a width direction of the pair of tapes (224, 323a, 324b), the coating (242, 322a, 322b) of each tape comprises a fin (230, 342a, 342b) which is comprised of a neck region having a uniform thickness and a bulbous region (241, 341a, 341 b) which gradually increases in thickness thereof from the neck region toward the coupling elements (220, 320a, 320b), wherein when the waterproof slide fastener is in the open state, in the cross-section taken along the width direction of the pair of tapes (224, 323a, 324b), the coating (242, 322a, 322b) of each tape (224, 323a, 324b) extends beyond an end edge of the respective tape (224, 323a, 324b) on which the coating (242, 322a, 322b) is provided, and each of the coupling elements (220, 320a, 320b) extends beyond an end edge of the coating (242, 322a, 322b) which is provided on the respective tape (224, 323a, 324b) to which the coupling elements (220, 320a, 320b) are attached, in the width direction of the pair of tapes (224, 323a, 324b). a pair of tapes (224, 323a, 324b) having: a plurality of coupling elements (220, 320a, 320b) attached to one side of each of the pair of tapes; and a coating (242, 322a, 322b) of polymeric maternal provided on the other side of each of the pair of tapes (224, 323a, 324b), and extending continuously along a longitudinal direction of the pair of tapes (224, 323a, 324b), wherein a plurality of coupling elements (220, 320a, 320b) attached to one side of each of the pair of tapes; and a coating (242, 322a, 322b) of polymeric maternal provided on the other side of each of the pair of tapes (224, 323a, 324b), and extending continuously along a longitudinal direction of the pair of tapes (224, 323a, 324b), wherein when the waterproof slide fastener is in an open state, in a cross-section taken along a width direction of the pair of tapes (224, 323a, 324b), the coating (242, 322a, 322b) of each tape comprises a fin (230, 342a, 342b) which is comprised of a neck region having a uniform thickness and a bulbous region (241, 341a, 341 b) which gradually increases in thickness thereof from the neck region toward the coupling elements (220, 320a, 320b), wherein when the waterproof slide fastener is in the open state, in the cross-section taken along the width direction of the pair of tapes (224, 323a, 324b), the coating (242, 322a, 322b) of each tape (224, 323a, 324b) extends beyond an end edge of the respective tape (224, 323a, 324b) on which the coating (242, 322a, 322b) is provided, and each of the coupling elements (220, 320a, 320b) extends beyond an end edge of the coating (242, 322a, 322b) which is provided on the respective tape (224, 323a, 324b) to which the coupling elements (220, 320a, 320b) are attached, in the width direction of the pair of tapes (224, 323a, 324b).