A park lock unit suitable for installation between an adjustment mechanism, in particular a manually actuated gear lever, and a park lock gear, in order to engage a locking member in the park lock gear in the parking position and to disengage it outside the parking position, the park lock unit is provided with an elongated receiving body, the rear end portion of which, facing away from the park lock gear in the installed state, is provided with an engagement portion protruding from the receiving body transversely to the longitudinal axis of the receiving body and rigidly connected to the receiving body, and the front end portion of which, facing the park lock gear in the installed state, is provided with a support portion projecting at the end and having a holding element, which is supported by means of a guide member against the spring force of an axially extending spring arranged on the receiving body and is displaceably mounted on the receiving body and carries at least one support element in its front region, which is suitable, in the installed state for actuating coupling elements for engaging and disengaging the locking member in the park lock gear, the spring being supported with its rear part against a rear abutment fixedly attached to the receiving body, characterized in that the holding element of the support portion is firmly connected to the guide member in its rear region, that the guide member is sleeve-shaped and is displaceably mounted on the receiving body, it surrounding a sub-region of the front end portion of the receiving body and being supported against the spring arranged on the receiving body, that the holding element is pushed onto the guide member by means of a receiving opening adapted with its inner periphery to an outer periphery of the guide member and is fixed immovably relative to the guide member in such a way that a distance predetermined for coupling to the adjustment mechanism in the correct position results between the holding element and the engagement portion, the guide member having two sub-portions that merge into one another via a shoulder, the rear sub-portion forming a sub-portion with an enlarged outer diameter and the front sub-portion forming a sliding portion onto which the holding element is pushed and immovably fixed, and that the enlarged sub-portion of the guide member is supported on the front part of the spring. the holding element of the support portion is firmly connected to the guide member in its rear region, that the guide member is sleeve-shaped and is displaceably mounted on the receiving body, it surrounding a sub-region of the front end portion of the receiving body and being supported against the spring arranged on the receiving body, that the holding element is pushed onto the guide member by means of a receiving opening adapted with its inner periphery to an outer periphery of the guide member and is fixed immovably relative to the guide member in such a way that a distance predetermined for coupling to the adjustment mechanism in the correct position results between the holding element and the engagement portion, the guide member having two sub-portions that merge into one another via a shoulder, the rear sub-portion forming a sub-portion with an enlarged outer diameter and the front sub-portion forming a sliding portion onto which the holding element is pushed and immovably fixed, and that the enlarged sub-portion of the guide member is supported on the front part of the spring.