To provide a plugging type synthetic resin cap formed from a structure exhibiting both a high sealing property and a plug-opening easiness property while eliminating the need for erroneous work of a separate collection.SOLUTION: A plugging type synthetic resin cap according to the present invention comprises a top face wall, and a skirt wall on which a plurality of intermittent parts extendedly provided upward from a lower end are formed along a circumferential direction while hanging (along an axial direction) from a peripheral edge of the top face wall. A plurality of leg parts are extended so as to sandwich the intermittent part therebetween from a lower end part of the skirt wall, and an engageable bent part with a container mouth is provided by bending back lower ends of the leg parts.SELECTED DRAWING: Figure 1

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