A screen printing apparatus including: an impression cylinder including a sheet holding device for holding a sheet and being configured to receive the sheet from a sheet transport device, which is arranged upstream in the sheet transport direction, through the sheet holding device and transport the sheet; and a rotary screen cylinder being in contact with the impression cylinder and configured to perform screen printing for the sheet held on the impression cylinder, wherein the sheet transport device is located above the impression cylinder, and the rotary screen cylinder is located to the side of the impression cylinder so that screen printing liquid accumulates in a squeegee portion (21, 23) of the rotary screen cylinder, characterized in that an installation angle θ of a squeegee of the squeegee portion (21, 23) is set at not less than 0 degrees with respect to a horizontal plane in a lateral direction of the squeegee, and the screen printing apparatus further includes: the squeegee abutting on an inner circumferential surface of a cylindrical screen plate that is attached to the rotary screen cylinder, the cylindrical screen plate including a plurality of holes, the squeegee being configured to push out liquid supplied to the inner circumferential surface of the screen plate through the holes onto a surface of the sheet held on the impression cylinder; a tank configured to reserve the liquid; a liquid supply device (28, 29, and 30) configured to supply the liquid reserved in the tank onto the squeegee; and a liquid recovery device (29, 31, 32, 33) configured to return the liquid flowing out of the squeegee to the tank, wherein the squeegee is inclined with respect to the horizontal plane in a longitudinal direction of the squeegee so that one end of the squeegee in the longitudinal direction is located higher than the other end thereof, and the liquid supply device (28, 29, 30) supplies the liquid to the one end of the squeegee while the liquid recovery device (29, 31, 32, 33) recovers the liquid from the other end of the squeegee. an impression cylinder including a sheet holding device for holding a sheet and being configured to receive the sheet from a sheet transport device, which is arranged upstream in the sheet transport direction, through the sheet holding device and transport the sheet; and a rotary screen cylinder being in contact with the impression cylinder and configured to perform screen printing for the sheet held on the impression cylinder, wherein the sheet transport device is located above the impression cylinder, and the rotary screen cylinder is located to the side of the impression cylinder so that screen printing liquid accumulates in a squeegee portion (21, 23) of the rotary screen cylinder, characterized in that an installation angle θ of a squeegee of the squeegee portion (21, 23) is set at not less than 0 degrees with respect to a horizontal plane in a lateral direction of the squeegee, and the screen printing apparatus further includes: the squeegee abutting on an inner circumferential surface of a cylindrical screen plate that is attached to the rotary screen cylinder, the cylindrical screen plate including a plurality of holes, the squeegee being configured to push out liquid supplied to the inner circumferential surface of the screen plate through the holes onto a surface of the sheet held on the impression cylinder; a tank configured to reserve the liquid; a liquid supply device (28, 29, and 30) configured to supply the liquid reserved in the tank onto the squeegee; and a liquid recovery device (29, 31, 32, 33) configured to return the liquid flowing out of the squeegee to the tank, wherein the squeegee is inclined with respect to the horizontal plane in a longitudinal direction of the squeegee so that one end of the squeegee in the longitudinal direction is located higher than the other end thereof, and the liquid supply device (28, 29, 30) supplies the liquid to the one end of the squeegee while the liquid recovery device (29, 31, 32, 33) recovers the liquid from the other end of the squeegee. the squeegee abutting on an inner circumferential surface of a cylindrical screen plate that is attached to the rotary screen cylinder, the cylindrical screen plate including a plurality of holes, the squeegee being configured to push out liquid supplied to the inner circumferential surface of the screen plate through the holes onto a surface of the sheet held on the impression cylinder; a tank configured to reserve the liquid; a liquid supply device (28, 29, and 30) configured to supply the liquid reserved in the tank onto the squeegee; and a liquid recovery device (29, 31, 32, 33) configured to return the liquid flowing out of the squeegee to the tank, wherein the squeegee is inclined with respect to the horizontal plane in a longitudinal direction of the squeegee so that one end of the squeegee in the longitudinal direction is located higher than the other end thereof, and the liquid supply device (28, 29, 30) supplies the liquid to the one end of the squeegee while the liquid recovery device (29, 31, 32, 33) recovers the liquid from the other end of the squeegee.