An electronic apparatus capable of communicating with an external device mounted thereon, the electronic apparatus comprising: an apparatus engagement unit into which an external engagement unit of the external device is configured to be mounted; and a plurality of apparatus wireless communicators (44, 45) located in the apparatus engagement unit so as to face a plurality of external wireless communicators (58, 57) located in the external engagement unit mounted into the apparatus engagement unit, respectively, characterised in that the plurality of apparatus wireless communicators (44, 45) is arranged in the apparatus engagement unit such that radiation characteristics of all of the plurality of apparatus wireless communicators (44, 45) are at least not parallel, the apparatus engagement unit comprises a metallic shoe plate that is engageable with the external engagement unit being slidably mountable into the apparatus engagement unit, wherein the metallic shoe plate laterally surrounds the external engagement unit on three sides, wherein a pair of engagement portions of the metallic shoe plate surrounding the external engagement unit on two sides is provided in parallel to a sliding direction, in which the external engagement unit is slidably mountable, and wherein a connection portion of the metallic shoe plate connecting the pair of engagement portions and surrounding the external engagement unit on a third side is provided perpendicular to the sliding direction, and a distance between the apparatus wireless communicators (44, 45) and the external wireless communicators (58, 57) facing each other in a state in which the external engagement unit has been slidably mounted into the apparatus engagement unit is shorter than at least a distance between the apparatus wireless communicators (44, 45) and the metallic shoe plate. an apparatus engagement unit into which an external engagement unit of the external device is configured to be mounted; and a plurality of apparatus wireless communicators (44, 45) located in the apparatus engagement unit so as to face a plurality of external wireless communicators (58, 57) located in the external engagement unit mounted into the apparatus engagement unit, respectively, characterised in that the plurality of apparatus wireless communicators (44, 45) is arranged in the apparatus engagement unit such that radiation characteristics of all of the plurality of apparatus wireless communicators (44, 45) are at least not parallel, the apparatus engagement unit comprises a metallic shoe plate that is engageable with the external engagement unit being slidably mountable into the apparatus engagement unit, wherein the metallic shoe plate laterally surrounds the external engagement unit on three sides, wherein a pair of engagement portions of the metallic shoe plate surrounding the external engagement unit on two sides is provided in parallel to a sliding direction, in which the external engagement unit is slidably mountable, and wherein a connection portion of the metallic shoe plate connecting the pair of engagement portions and surrounding the external engagement unit on a third side is provided perpendicular to the sliding direction, and a distance between the apparatus wireless communicators (44, 45) and the external wireless communicators (58, 57) facing each other in a state in which the external engagement unit has been slidably mounted into the apparatus engagement unit is shorter than at least a distance between the apparatus wireless communicators (44, 45) and the metallic shoe plate.