A creeper cum work seat has two end platforms (1, 5) in sliding attachment to slide rods (4, 35, 36) in slideways (3, 6) with which the two end platforms can be slid apart to opposite ends of a central platform (7) to form a full-length creeper in creeper mode (11). The central platform becomes a work seat and the two end portions become a shelf platform under the work seat when the two end platforms are slid edge-to-edge in a seat mode(10). Seat-support members (12, 13) are attached pivotally to the central platform and to the two end platforms to support the central platform as a seat in a seat mode and to position the central portion between the two end platforms in a creeper mode.