To provide an imaging apparatus including an imaging apparatus unit enabling a temperature of an imaging device as a whole to be uniform and radiating a heat of the imaging device efficiently and stably.

An imaging unit includes: an imaging device; a support plate having a heat radiation property for maintaining the imaging device; a housing having a heat radiation property; a shield case attached to the housing and having a shield property; and a heat conduction member adhered to the imaging device and held in a sandwiched manner by the support plate, and having the tongue part. An end of the heat conduction member is held in a sandwiched manner by the housing and the shield case.