Machine tool, in particular hand-held machine tool, having a machine-tool housing and a handle assembly that can be adjusted in terms of its angular position with respect to the machine-tool housing, wherein the handle assembly includes: at least one handle with at least one coupling means, which can be adjusted in terms of its angular position relative to at least one mating coupling means of the machine-tool housing and can be moved linearly along a movement axis, and a locking mechanism, which is designed to fix the handle in a coupled state, in which the coupling means of the handle is in engagement with the mating coupling means of the machine-tool housing, so that the handle and the machine-tool housing are firmly connected to each other, and to release the same in an uncoupled state, in which the coupling means of the handle is out of engagement with the mating coupling means of the machine-tool housing, so that the handle can be adjusted in terms of its angular position relative to the machine-tool housing, wherein the locking mechanism includes: an eccentric lever having a first end and a second end, which can be pivoted reversibly between a locked position and a release position about a pivot axis extending at right angles to the movement axis and provided in the area of the second end, at least one bearing element for pivotably supporting and holding the eccentric lever, and a stop for the eccentric lever for defining a predetermined distance between the pivot axis and the mating coupling means of the machine-tool housing, wherein at least one cam contour, the centre of which is located outside the pivot axis, is provided at the second end of the eccentric lever, so that the handle is transferred into the coupled state by pivoting the eccentric lever into the locked position and is released into the uncoupled state by pivoting the eccentric lever into the release position, characterized in that the locking mechanism further includes a spring element which is arranged between the machine-tool housing and the handle and which transfers the handle from the coupled state into the uncoupled state. at least one handle with at least one coupling means, which can be adjusted in terms of its angular position relative to at least one mating coupling means of the machine-tool housing and can be moved linearly along a movement axis, and a locking mechanism, which is designed to fix the handle in a coupled state, in which the coupling means of the handle is in engagement with the mating coupling means of the machine-tool housing, so that the handle and the machine-tool housing are firmly connected to each other, and to release the same in an uncoupled state, in which the coupling means of the handle is out of engagement with the mating coupling means of the machine-tool housing, so that the handle can be adjusted in terms of its angular position relative to the machine-tool housing, an eccentric lever having a first end and a second end, which can be pivoted reversibly between a locked position and a release position about a pivot axis extending at right angles to the movement axis and provided in the area of the second end, at least one bearing element for pivotably supporting and holding the eccentric lever, and a stop for the eccentric lever for defining a predetermined distance between the pivot axis and the mating coupling means of the machine-tool housing, wherein at least one cam contour, the centre of which is located outside the pivot axis, is provided at the second end of the eccentric lever, so that the handle is transferred into the coupled state by pivoting the eccentric lever into the locked position and is released into the uncoupled state by pivoting the eccentric lever into the release position,