According to this seal member 42, as shown in FIGS. 6 and 7, a gap between the heat sink 36 of the heat transfer member 30 passing through the through hole 18b of the main frame 18 and the inner peripheral surface of the through hole 18b is sealed. Thus, the flow FP of outside air from inside the duct 18a shown in FIG. 6 toward the image sensor 14 through the through hole 18b is blocked. As a result, adhesion of foreign matter such as dust to the image sensor 14 is suppressed.

It should be noted that in the case of the present embodiment, as shown in FIG. 7, the seal member 42 (the base portion 42a thereof) is fixed to the main frame 18 by being sandwiched between the annular seal presser plate 44 fixed to the main frame 18 and the main frame 18.

As described above, according to the present embodiment, in the imaging apparatus 10 that cools the image sensor 14 using the outside air, it is possible to prevent the foreign matter such as dust included in the outside air from reaching the image sensor 14.

Specifically, in the imaging apparatus 10 according to the present embodiment, the image sensor 14 and the heat transfer member 30 are not in direct contact with the main frame 18 including the duct 18a. Thus, no force is applied from the main frame 18 to the heat transfer member 30, and the positional relationship between the image sensor 14 supported by the heat transfer member 30 and the lens attachment portion 16 is appropriately maintained.