To provide an imaging apparatus and an electronic apparatus which are capable of combining downsizing and high efficiency of heat dissipation to obtain high-quality image with reduced noise.

An imaging apparatus 1 comprising an imaging device (an image chip 20) which performs photoelectric conversion of received light and outputs, as an image signal, an electric signal obtained by the photoelectric conversion comprises: a first transmission member which transmits heat of a first portion of a relatively small heat generation quantity within the imaging apparatus; a second transmission member which transmits heat of a second portion larger in heat generation quantity than the first portion; and a single heat dissipation member 40 which connects with the first and second transmission members at different portions.