To provide an assembly structure in which disadvantages such as an increase in the number of components, complexity of structure, and degradation in assembly, and increase in the size in achieving an impact resistant structure, and to provide an imaging apparatus using the assembly structure.

In the assembly structure in which a support member 15 for preventing deformation of an internal structure body is disposed between the internal structure and a front cover surrounding the internal structure, at least one support member 15 is disposed almost at the middle part 14 of an area opposite the front cover of the internal structure.