PROBLEM TO BE SOLVED: To provide a mailbox which can be easily replaced with an existing mailbox embedded in a gatepost, a gatepost with the mailbox, and a method for replacing the mailbox.SOLUTION: A mailbox 3 according to one embodiment of the invention is the mailbox 3 which is installed in an installation hole 10 as a substitute for an existing mailbox 2 installed in the installation hole 10 of a gatepost 1 through first joint filler 4. The mailbox 3 has a main body 32, the overall size of which is smaller than that of the existing mailbox 2. The main body 32 of the mailbox 3 is installed through second joint filler 5 inside the first joint filler 4 left in the installation hole 10 in a frame shape when the existing mailbox 2 is detached from the installation hole 10.SELECTED DRAWING: Figure 1
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