An imaging apparatus, to which a first lens apparatus that performs communication at a first voltage and a second lens apparatus that performs communication at a second voltage, that differs from the first voltage, are detachably mountable, the imaging apparatus comprising: distinguishing means arranged to distinguish a type of a mounted lens apparatus (200, 300); and a mount unit including a plurality of electric contacts (1001 - 1012), wherein the plurality of electric contacts (1001 - 1012) includes: a first electric contact configured to supply electric power to a mounted lens apparatus (200, 300), a second electric contact configured to correspond to a ground level of the first electric contact, and a third electric contact configured to be used for distinguishing a type of a mounted lens apparatus (200, 300) by the distinguishing means, wherein the first electric contact and the second electric contact are both disposed adjacent to the third electric contact, wherein, in a case where the voltage of the third electric contact is a voltage in a first voltage range that does not include the voltage of the first electric contact and does not include the voltage of the second electric contact, the distinguishing means distinguishes a mounted lens apparatus (200, 300) to be the first lens apparatus, and wherein, in a case where the voltage of the third electric contact is a voltage of a second voltage range that does not include the first voltage range, does not include the voltage of the first electric contact, and does not include the voltage of the second electric contact, the distinguishing means distinguishes a mounted lens apparatus (200, 300) to be the second lens apparatus. distinguishing means arranged to distinguish a type of a mounted lens apparatus (200, 300); and a mount unit including a plurality of electric contacts (1001 - 1012), wherein the plurality of electric contacts (1001 - 1012) includes: a first electric contact configured to supply electric power to a mounted lens apparatus (200, 300), a second electric contact configured to correspond to a ground level of the first electric contact, and a third electric contact configured to be used for distinguishing a type of a mounted lens apparatus (200, 300) by the distinguishing means, a first electric contact configured to supply electric power to a mounted lens apparatus (200, 300), a second electric contact configured to correspond to a ground level of the first electric contact, and a third electric contact configured to be used for distinguishing a type of a mounted lens apparatus (200, 300) by the distinguishing means, wherein the first electric contact and the second electric contact are both disposed adjacent to the third electric contact, wherein, in a case where the voltage of the third electric contact is a voltage in a first voltage range that does not include the voltage of the first electric contact and does not include the voltage of the second electric contact, the distinguishing means distinguishes a mounted lens apparatus (200, 300) to be the first lens apparatus, and wherein, in a case where the voltage of the third electric contact is a voltage of a second voltage range that does not include the first voltage range, does not include the voltage of the first electric contact, and does not include the voltage of the second electric contact, the distinguishing means distinguishes a mounted lens apparatus (200, 300) to be the second lens apparatus.