A print head comprising: a head body portion having a printing portion that performs printing on a recording medium and facing a platen roller configured to transport the recording medium; a supporting mechanism that supports the head body portion and presses the head body portion against the platten roller; characterized in that the supporting mechanism allows the platen roller to move the head body portion in such a direction that a contact position of the head body portion with respect to the platen roller is shifted while maintaining the head body portion pressed against the platen roller, wherein the supporting mechanism includes a rotation support surface that comes in contact with a rotary shaft which is parallel to a rotational axis line of the platen roller, and a guide surface which is continuous to the rotation support surface and that extends toward a side of the contact position of the head body portion with respect to the platen roller, wherein the rotation support surface or the guide surface is pressed against the rotary shaft by a contact between the head body portion and the platen roller, wherein the rotary shaft moves relative to and along the guide surface so as to move the contact position of the head body portion with respect to the platen roller and the supporting mechanism rotates about the rotary shaft at the rotation support surface so as to move the contact position of the head body portion with respect to the platen roller, and wherein the guide surface is inclined in a direction of extending to a back side of the head body portion as it goes to a side of the rotation support surface. a head body portion having a printing portion that performs printing on a recording medium and facing a platen roller configured to transport the recording medium; a supporting mechanism that supports the head body portion and presses the head body portion against the platten roller; characterized in that the supporting mechanism allows the platen roller to move the head body portion in such a direction that a contact position of the head body portion with respect to the platen roller is shifted while maintaining the head body portion pressed against the platen roller, wherein the supporting mechanism includes a rotation support surface that comes in contact with a rotary shaft which is parallel to a rotational axis line of the platen roller, and a guide surface which is continuous to the rotation support surface and that extends toward a side of the contact position of the head body portion with respect to the platen roller, wherein the rotation support surface or the guide surface is pressed against the rotary shaft by a contact between the head body portion and the platen roller, wherein the rotary shaft moves relative to and along the guide surface so as to move the contact position of the head body portion with respect to the platen roller and the supporting mechanism rotates about the rotary shaft at the rotation support surface so as to move the contact position of the head body portion with respect to the platen roller, and wherein the guide surface is inclined in a direction of extending to a back side of the head body portion as it goes to a side of the rotation support surface.