A projection lens (PL), configured to image an image beam (IMB) provided by a light valve (LV) disposed on a reduced side onto a projection surface (PS) disposed on a magnified side, wherein the light valve (LV) has an angle with the projection surface (PS), and the projection lens (PL) comprises a first lens group (LG1), a second lens group (LG2), and an aperture stop (AS), wherein the first lens group (LG1) is disposed between the reduced side and the magnified side and has a first optical axis (X1); the second lens group (LG2) consists of a deflecting prism (RP) and is disposed between the first lens group (LG1) and the magnified side, wherein the deflecting prism (RP) has a light incident surface (RP3), a reflective surface (RP2), and a light emitting surface (RP1), the light incident surface (RP3) faces the first lens group (LG1), the light emitting surface (RP1) faces the projection surface (PS), the light incident surface (RP3), the light emitting surface (RP2), and the first lens group (LG1) are disposed on a same side of the reflective surface (RP2), and wherein the light incident surface (RP3) is a concave surface, the light emitting surface (RP1) is a convex surface, and at least one of the light incident surface (RP3), the reflective surface (RP2), and the light emitting surface (RP1) is a freeform surface; and the aperture stop (AS) is disposed between the first lens group (LG1) and the second lens group (LG2), wherein the light valve (LV) is configured to provide the image beam (IMB), the image beam (IMB) sequentially passes through the first lens group (LG1), travels through the aperture stop (AS), passes through the light incident surface (RP3) of the second lens group (LG2), is reflected by the reflective surface (RP2) of the second lens group (LG2), and passes through the light emitting surface (RP3) of the second lens group (LG2) to be transmitted to the projection surface (PS), and the first optical axis (X1) of the first lens group (LG1) does not overlap with a center of the image beam (IMB). the first lens group (LG1) is disposed between the reduced side and the magnified side and has a first optical axis (X1); the second lens group (LG2) consists of a deflecting prism (RP) and is disposed between the first lens group (LG1) and the magnified side, wherein the deflecting prism (RP) has a light incident surface (RP3), a reflective surface (RP2), and a light emitting surface (RP1), the light incident surface (RP3) faces the first lens group (LG1), the light emitting surface (RP1) faces the projection surface (PS), the light incident surface (RP3), the light emitting surface (RP2), and the first lens group (LG1) are disposed on a same side of the reflective surface (RP2), and wherein the light incident surface (RP3) is a concave surface, the light emitting surface (RP1) is a convex surface, and at least one of the light incident surface (RP3), the reflective surface (RP2), and the light emitting surface (RP1) is a freeform surface; and the aperture stop (AS) is disposed between the first lens group (LG1) and the second lens group (LG2), wherein the light valve (LV) is configured to provide the image beam (IMB), the image beam (IMB) sequentially passes through the first lens group (LG1), travels through the aperture stop (AS), passes through the light incident surface (RP3) of the second lens group (LG2), is reflected by the reflective surface (RP2) of the second lens group (LG2), and passes through the light emitting surface (RP3) of the second lens group (LG2) to be transmitted to the projection surface (PS), and the first optical axis (X1) of the first lens group (LG1) does not overlap with a center of the image beam (IMB). <EOS>