To provide a cap which enables a cutting channel to be easily cut off when the spout of an inner plug is opened and a removed part to be unplugged even when the cap becomes hard at low temperature or the cap is formed of a synthetic resin being relatively rigid.

The cap consists of an inner plug B fitted on the mouth cylindrical part 1 of a container main body A and an outer cap D. The inner plug is equipped with the inner peripheral wall 5 equipped with a bottom wall 6 on which a pull-ring 14 is erected through a support 13 on a removing part 11 provided with the cutting channel 12 opening a spout. The support has the outer periphery whose lower part sectional face is formed round, and the removing part consists of a spout part and a support continuously providing part. The support continuously providing part is composed of a head part formed surrounding the outer edge of the lower face of the support and a joint with a narrower width than that of the head part and continuously provided on the spout part. The cutting channel is provided so as to be close to the outer edge of the lower face of the support.