To provide an assembly kit of a film unit with a lens that can be assembled even by a young user.

In the assembly kit of a film unit with a lens, front cover sub-assembly parts 85, main body base part sub-assembly parts 86, a small film box 87 housing a 110 type film cartridge and a parts tray 88 housing a plurality of single parts constituting a photographing mechanism are housed in an inner box 81. In the front cover sub-assembly parts 85 and the main body base part sub-assembly parts 86, single parts that are difficult to assemble are included in a front cover and a main body base part in advance. The parts tray 88 is divided into a plurality of housing parts, and the number of each of the housing parts is used as both the number of a housed single part and an assembling sequence. The numbers of parts to be mounted are displayed at parts where single parts of the front cover sub-assembly parts 85 and the main body base part sub-assembly parts 86 are mounted.