To provide a cap having a structure capable of reducing the number of components.SOLUTION: A cap 20 according to the preset invention comprises a cap body 30 attached to a mouth part 11 of a container body 10 where a content is stored and including a discharge hole 33 for discharging the content; and a slit valve 50 for closing the discharge hole 33 in an openable manner. The cap body 30 and the slit valve 50 are integrally molded. The cap body 30 comprises a cylindrical peripheral wall 31 extending in an upward/downward direction, and an annular top wall 32 spreading inward in a radial direction from above the peripheral wall 31. The slit valve 50 comprises a cylindrical part 52 extending in an upward/downward direction inside the discharge hole 33, and a valve part 51 spreading inward in a radial direction from a lower position than an upper...

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