On-board power supply connector, in particular for high-voltage on-board power supplies, comprising, a first connection part arranged in a first housing part, the first housing part having a longitudinal extension along a longitudinal axis and having an end-face opening, and the first connection part being mounted in the first housing part such that it can move along the longitudinal axis, a second connection part arranged in a second housing part, the second housing part having a longitudinal extension along a longitudinal axis and having an end-face opening, characterized in that, in the connected state of the connector, a fastening lever which can be pivoted about an axis perpendicular to the longitudinal axis is arranged on one of the housing parts and, in the connected state of the connector, engages with a fastening means on the other housing part, wherein, in the connected state of the connector, the longitudinal axes of the first and second housing parts extend collinearly and the second housing part is fixed relative to the first housing part at least in the longitudinal direction and the second connection part is in mechanical contact with the first connection part, characterized in that the first connection part is resiliently mounted in the first housing part along the longitudinal axis by a spring element.