A mobile handheld machine saw (10) having a saw assembly (11), which has a saw toolholder (14) for a saw tool (15), in particular a saw blade, and a saw drive motor (12) for driving the saw toolholder (14), and having a guide device (17), which has a guide body (18) having a guide surface (19) for guiding the handheld machine saw (10) along a working direction (AR) on a workpiece (W) and on its upper side (19A) opposite to the guide surface (19), the saw toolholder (14) is movably mounted by means of a saw depth setting bearing (16) between an upper depth setting position (UT) in which the saw toolholder (14) is adjusted closer to the guide surface (19) than in the upper depth setting position (OT).