Cap

Abstract

A cap includes a cap includes a cap body including a disk-shaped top plate portion and a cylindrical skirt portion provided at a peripheral edge portion of the top plate portion; a sealing member provided separately from the cap body in the cap body so as to face the top plate portion, the sealing member having an outer diameter smaller than an inner diameter of the skirt portion; a bead portion provided in the skirt portion, restricting movement of the sealing member in a direction away from the top plate portion, supporting the sealing member, and protruding annularly inward in a radial direction of the skirt portion; and a slit portion provided in the bead portion.

1 . A cap comprising:
 a cap body including a disk-shaped top plate portion and a cylindrical skirt portion provided at a peripheral edge portion of the top plate portion;   a sealing member provided separately from the cap body in the cap body so as to face the top plate portion, the sealing member having an outer diameter smaller than an inner diameter of the skirt portion;   a bead portion provided in the skirt portion, restricting movement of the sealing member in a direction away from the top plate portion, supporting the sealing member, and protruding annularly inward in a radial direction of the skirt portion; and   a slit portion provided in the bead portion.   
     
     
         2 . The cap according to  claim 1 , wherein the slit portion is formed closer to a distal end side of the skirt portion than a portion of the bead portion having a smallest inner diameter. 
     
     
         3 . The cap according to  claim 1 , wherein
 the slit portion includes a first end portion on a side of the top plate portion and a second end portion on a distal end side of the skirt portion, and   the first end portion is located inward in a radial direction of the skirt portion with respect to the second end portion.   
     
     
         4 . The cap according to  claim 3 , wherein a distal and of the first end portion extends in an axial direction of the skirt portion. 
     
     
         5 . The cap according to  claim 1 , comprising a plurality of recessed portions provided in the skirt portion on the top plate portion side with respect to the bead portion and provided in a circumferential direction.