A tool clamping device, in particular a saw-tool clamping device, for a portable power tool, includes at least one clamping unit configured to clamp-in a machining tool, which comprises at least one movably mounted release element configured to transfer the clamping unit into a releasing position, at least one clamping element configured to produce a clamping-in force acting on the machining tool, at least in a state of the machining tool in which the machining tool is connected to the clamping unit, and at least one movement-arresting element configured to arrest at least one possibility of movement of the release element in at least one state. The movement-arresting element is fixedly connected to the clamping element.