A profile cylinder, which extends along a longitudinal axis, comprising - at least one pin tumbler which has a core pin, a housing pin and a tumbler spring; - an outer housing which has a substantially hollow cylindrical core receiving section and a flange section projecting radially away from the core receiving section with respect to the longitudinal axis, wherein the flange section is closed at a front side of the outer housing; - a cylinder core which is rotatably supported in the core receiving section of the outer housing and which has at least one tumbler passage in which the respective core pin is received; and - an inner housing which has at least one tumbler passage in which the respective tumbler spring and the respective housing pin are received, wherein the flange section is open at a rear side of the outer housing and the inner housing is inserted into the flange section through the rear side of the outer housing, in particular along the longitudinal axis or along a direction extending inclined to the longitudinal axis; or wherein the flange section is open at a lower side of the outer housing and the inner housing is inserted into the flange section through the lower side of the outer housing, in particular along a transverse axis perpendicular to the longitudinal axis or along a direction extending inclined to the transverse axis, characterized in that the at least one tumbler passage of the inner housing is closed by the inner housing at a lower side facing away from the cylinder core so that the respective received tumbler spring and the respective received housing pin cannot fall out of the inner housing. - at least one pin tumbler which has a core pin, a housing pin and a tumbler spring; - an outer housing which has a substantially hollow cylindrical core receiving section and a flange section projecting radially away from the core receiving section with respect to the longitudinal axis, wherein the flange section is closed at a front side of the outer housing; - a cylinder core which is rotatably supported in the core receiving section of the outer housing and which has at least one tumbler passage in which the respective core pin is received; and - an inner housing which has at least one tumbler passage in which the respective tumbler spring and the respective housing pin are received, wherein the flange section is open at a rear side of the outer housing and the inner housing is inserted into the flange section through the rear side of the outer housing, in particular along the longitudinal axis or along a direction extending inclined to the longitudinal axis; or wherein the flange section is open at a lower side of the outer housing and the inner housing is inserted into the flange section through the lower side of the outer housing, in particular along a transverse axis perpendicular to the longitudinal axis or along a direction extending inclined to the transverse axis, characterized in that the at least one tumbler passage of the inner housing is closed by the inner housing at a lower side facing away from the cylinder core so that the respective received tumbler spring and the respective received housing pin cannot fall out of the inner housing.