Impact crusher for mineral material comprising: a. a crusher housing; b. a reversible rotor with a horizontal axis of rotation for throwing mineral material against wear bodies in the crusher housing; c. a drive to drive the rotor; d. an impact grinding chamber, which is delimited by at least one impact mechanism that is adjustable relative to the crusher housing and the rotor, wherein the rotor is arranged in the impact grinding chamber; e. at least one adjusting apparatus (24, 25, 26) for adjusting the distance of the impact mechanism from the rotor; f. an upper impact chamber adjoining the impact grinding chamber at the top and having an inlet opening for the mineral material to be crushed, wherein the upper impact chamber has an upper height region adjacent to the inlet opening, an adjoining central height region and a lower height region, which adjoins the lower impact grinding chamber, wherein each height region (H1, H2, H3) has a horizontally measured, inner width, wherein the central height region is the region with the largest inner width and has a maximum width at its widest point which is above the impact circle of the rotor, which is greater than the diameter of the impact circle of the rotor, characterized in that a width of the inlet opening can be adjusted by adjusting the width of the upper impact chamber; impact rockers (22, 23) of the impact mechanism of the impact grinding chamber extend into the upper impact chamber, so that the width of the impact grinding chamber can be adjusted together with the width of the upper impact chamber; the adjusting apparatus has an upper impact rocker adjustment for adjusting the widths (B1, B2) of the upper impact chamber and the inlet opening to a maximum feed size of the mineral material to be crushed and a lower impact rocker adjustment for adjusting the distance of the wear bodies in the lower impact grinding chamber to an impact circle of the rotor. a. a crusher housing; b. a reversible rotor with a horizontal axis of rotation for throwing mineral material against wear bodies in the crusher housing; c. a drive to drive the rotor; d. an impact grinding chamber, which is delimited by at least one impact mechanism that is adjustable relative to the crusher housing and the rotor, wherein the rotor is arranged in the impact grinding chamber; e. at least one adjusting apparatus (24, 25, 26) for adjusting the distance of the impact mechanism from the rotor; f. an upper impact chamber adjoining the impact grinding chamber at the top and having an inlet opening for the mineral material to be crushed, wherein the upper impact chamber has an upper height region adjacent to the inlet opening, an adjoining central height region and a lower height region, which adjoins the lower impact grinding chamber, wherein each height region (H1, H2, H3) has a horizontally measured, inner width, wherein the central height region is the region with the largest inner width and has a maximum width at its widest point which is above the impact circle of the rotor, which is greater than the diameter of the impact circle of the rotor, characterized in that a width of the inlet opening can be adjusted by adjusting the width of the upper impact chamber; impact rockers (22, 23) of the impact mechanism of the impact grinding chamber extend into the upper impact chamber, so that the width of the impact grinding chamber can be adjusted together with the width of the upper impact chamber; the adjusting apparatus has an upper impact rocker adjustment for adjusting the widths (B1, B2) of the upper impact chamber and the inlet opening to a maximum feed size of the mineral material to be crushed and a lower impact rocker adjustment for adjusting the distance of the wear bodies in the lower impact grinding chamber to an impact circle of the rotor.