A medical device (1, 1A, 1B, 1C, 1D) comprising: an insertion portion which is capable of being inserted into a body; and a driving mechanism which is coupled to the insertion portion, wherein the insertion portion includes: a treatment portion which is configured to perform a treatment on a treatment target portion; a joint portion which is configured to be capable of supporting the treatment portion and changing a direction of the treatment portion; a storage portion which is configured in the joint portion and capable of internally accommodating the treatment portion; and a driving force transmission portion which is connected to the joint portion and configured to transmit a driving force for changing the direction of the treatment portion to the joint portion, wherein the driving mechanism includes a driving force generation portion which is configured to generate the driving force connected to the driving force transmission portion, and wherein the treatment portion enters and exits the storage portion by the driving force transmitted from the driving force generation portion to the joint portion through the driving force transmission portion, wherein the treatment portion includes an incision electrode which is configured to receive a supply of a heigh-frequency current to incise living tissue, the joint portion includes a switching mechanism which is configured to switch a conductive state of the high-frequency current for the incision electrode, the insertion portion further includes a power supplying cable which is connected to the switching mechanism and from which the high-frequency current is applied, the driving mechanism further includes a plug which is connected to the power supplying cable and connectable to a high-frequency power supply device, and the switching mechanism cuts off a current applied to the power supplying cable and the incision electrode when the incision electrode is positioned inside the storage portion, and electrically connects the power supplying cable and the incision electrode when the incision electrode is positioned outside the storage portion. an insertion portion which is capable of being inserted into a body; and a driving mechanism which is coupled to the insertion portion, wherein the insertion portion includes: a treatment portion which is configured to perform a treatment on a treatment target portion; a joint portion which is configured to be capable of supporting the treatment portion and changing a direction of the treatment portion; a storage portion which is configured in the joint portion and capable of internally accommodating the treatment portion; and a driving force transmission portion which is connected to the joint portion and configured to transmit a driving force for changing the direction of the treatment portion to the joint portion, a treatment portion which is configured to perform a treatment on a treatment target portion; a joint portion which is configured to be capable of supporting the treatment portion and changing a direction of the treatment portion; a storage portion which is configured in the joint portion and capable of internally accommodating the treatment portion; and a driving force transmission portion which is connected to the joint portion and configured to transmit a driving force for changing the direction of the treatment portion to the joint portion, wherein the driving mechanism includes a driving force generation portion which is configured to generate the driving force connected to the driving force transmission portion, and wherein the treatment portion enters and exits the storage portion by the driving force transmitted from the driving force generation portion to the joint portion through the driving force transmission portion, wherein the treatment portion includes an incision electrode which is configured to receive a supply of a heigh-frequency current to incise living tissue, the joint portion includes a switching mechanism which is configured to switch a conductive state of the high-frequency current for the incision electrode, the insertion portion further includes a power supplying cable which is connected to the switching mechanism and from which the high-frequency current is applied, the driving mechanism further includes a plug which is connected to the power supplying cable and connectable to a high-frequency power supply device, and the switching mechanism cuts off a current applied to the power supplying cable and the incision electrode when the incision electrode is positioned inside the storage portion, and electrically connects the power supplying cable and the incision electrode when the incision electrode is positioned outside the storage portion.