A medical apparatus comprising medical device and a plurality of caster units which are arranged below the medical device and movably support the medical device, wherein each of the plurality of caster units includes: a wheel part that includes a wheel, a wheel support part supporting the wheel to be rotatable with reference to a first rotational axis parallel to a ground, and a caster support part connected to a portion of the wheel support part that is spaced apart from the first rotational axis and extending in a direction perpendicular to the first rotational axis; and an impact absorption part configured to support the wheel part and absorb an impact applied to the wheel part, wherein the impact absorption part includes: a wheel fixing member surrounding the caster support part and fixed to the caster support part; a body fixing member surrounding the wheel fixing member and fixed to the medical device; and a buffer member that is disposed between the wheel fixing member and the body fixing member and elastically deformable, and the buffer member includes: a first deformation part extending in a direction parallel to an extension direction of the caster support part; and characterized by a second deformation part extending from the first deformation part in a direction parallel to the ground, wherein the first deformation part has a first groove disposed in one end of the buffer member, wherein the second deformation part has a second groove disposed in another end of the buffer member, and the first groove and the second groove are comprised to induce natural elastic deformation of the buffer member. a wheel part that includes a wheel, a wheel support part supporting the wheel to be rotatable with reference to a first rotational axis parallel to a ground, and a caster support part connected to a portion of the wheel support part that is spaced apart from the first rotational axis and extending in a direction perpendicular to the first rotational axis; and an impact absorption part configured to support the wheel part and absorb an impact applied to the wheel part, wherein the impact absorption part includes: a wheel fixing member surrounding the caster support part and fixed to the caster support part; a body fixing member surrounding the wheel fixing member and fixed to the medical device; and a buffer member that is disposed between the wheel fixing member and the body fixing member and elastically deformable, and the buffer member includes: a first deformation part extending in a direction parallel to an extension direction of the caster support part; and characterized by a second deformation part extending from the first deformation part in a direction parallel to the ground, wherein the first deformation part has a first groove disposed in one end of the buffer member, wherein the second deformation part has a second groove disposed in another end of the buffer member, and the first groove and the second groove are comprised to induce natural elastic deformation of the buffer member. a wheel fixing member surrounding the caster support part and fixed to the caster support part; a body fixing member surrounding the wheel fixing member and fixed to the medical device; and a buffer member that is disposed between the wheel fixing member and the body fixing member and elastically deformable, and the buffer member includes: a first deformation part extending in a direction parallel to an extension direction of the caster support part; and characterized by a second deformation part extending from the first deformation part in a direction parallel to the ground, wherein the first deformation part has a first groove disposed in one end of the buffer member, wherein the second deformation part has a second groove disposed in another end of the buffer member, and the first groove and the second groove are comprised to induce natural elastic deformation of the buffer member. a first deformation part extending in a direction parallel to an extension direction of the caster support part; and characterized by a second deformation part extending from the first deformation part in a direction parallel to the ground, wherein the first deformation part has a first groove disposed in one end of the buffer member, wherein the second deformation part has a second groove disposed in another end of the buffer member, and the first groove and the second groove are comprised to induce natural elastic deformation of the buffer member.