To provide a resealable with improved productivity by shortening the time required from filling to airtight sealing, configured to stably store an unsealed can component with a small occupancy space and, further, to improve flexibility in designing a can body, and to provide a method of filling the resealable can with contents.

The resealable can 1 includes: a shoulder member 3 which has a neck part 5 formed on the upper side and is penetrated in the vertical direction; a seal member 4 fitted to the neck part 5 so as to be resealable; and a bottomed can body 2 doubly seamed below the shoulder member 3. The shoulder member 3 is configured to receive the seal member 4 from below before double seaming. The inner surface of the shoulder member 3 has a support receiving surface 42a which is supported by the seal member 4 when receiving the seal member 4, and the outer surface of the seal member 4 has a support surface 50a which supports the support receiving surface 42a. A complementary shape is formed where the support receiving surface 42a and the support surface 50a are brought into surface contact with each other, so as to enable the stacking between the shoulder member 3 and the seal member 4.