Problem to be solved: To provide a bottle cap, a contained liquid storage bottle, and a manufacturing method of the bottle cap, which can store charged powder without causing deterioration or the like, accurately and easily charge the stored charged powder into the bottle, and can quickly and effectively dissolve the charged powder charged into the contained liquid, with a structure as simple as possible. Solution: A cylindrical cap body 8 is provided in which a bottle mouth part 4 can enter from openings 10, 11 on one side and the other side, and a partition wall part 13 is provided on the inner side to form a space 14 on one side and a space 15 on the other side. In the one side space 14, a length from the one side opening 10 to the partition wall part 13 is a length to close the opening of the...

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