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 ; 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 , 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 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 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 to be the second lens apparatus . distinguishing means arranged to distinguish a type of a mounted lens apparatus ; 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 , 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 by the distinguishing means , a first electric contact configured to supply electric power to a mounted lens apparatus , 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 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 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 to be the second lens apparatus . <EOS>