The invention provides an imaging apparatus and a hinge mechanism, wherein the hinge mechanism is arranged between a main body and a door, is openably and closably supporting the door, and comprises: a fixed-side hinge plate disposed at the main body; and a movable side hinge plate disposed at the door, wherein the fixed-side hinge plate includes a bearing surface and a plurality of projection portions projected from the bearing surface, and the fixed-side hinge plate is mountable to (1) a first mounting portion of the main body, having holes through which the projection portions can be inserted, and being capable of abutting to the bearing surface, and (2) a second mounting portion of the main body, being capable of abutting to end surfaces of the plurality of projection portions.