<p>A rotation type oil damper is disclosed which has a stable damping efficiency with a simple structure, capable of adjust a damping force in accordance with a rotation position. A rotation type oil damper includes a housing having an inner space; a rotational shaft inserted in the housing to form an airtight space in which viscous fluid is filled, the rotational shaft configured to damp a rotational force of an outer device as a blade formed in a predetermined portion of the rotational shaft moves in the viscous fluid, when rotating in communication with the outer device; a through hole that passes through the rotational shaft to communicate the airtight space with an outside; and a fixing member fixedly inserted in the through hole to close the through hole airtight.</p>
