A printing apparatus using an endless belt-shaped printing plate comprising: a plate cylinder (16, 18), a guide roller and the endless belt-shaped printing plate wound about the plate cylinder (16, 18) and the guide roller for printing on a continuous form supplied between the plate cylinder (16, 18) and an impression cylinder, wherein said plate cylinder (16, 18) is provided with feed pins which are disposed in rows at an even pitch along an outer periphery of the plate cylinder at both ends in the axial direction of the plate cylinder so as to project and retract freely and guided by a fixed cam ring and so as to project out of the plate cylinder surface in a region forming a central angle of at least 150 degrees of the plate cylinder opposite to the guide roller of the plate cylinder, said endless belt-shaped printing plate is provided with pin feed holes at marginal zones at both sides in a width direction of the endless belt-shaped printing plate so that the pin feed holes are disposed in rows along the longitudinal direction of the endless belt-shaped printing plate at an even pitch which is identical to the pitch of said feed pins, said pin feed holes formed at the marginal zones of the endless belt-shaped printing plate are engaged with said feed pins of the plate cylinder, thereby guiding the movement of the endless belt-shaped printing plate, each feedpin comprises a pinhead engageable with one of the pin feed holes formed in the marginal zones of the endless belt-shaped printing plate, and a cam slot engageable with the fixed cam ring, and said fixed cam ring has a diameter smaller than that of the plate cylinder (16, 18) and a center which is shifted to a side opposite to the guide roller from the axial center of the plate cylinder (16, 18), characterized in that said plate cylinder (16, 18) and impression cylinder are composed not as a hollow cylinder but as solid cylinders formed by filing or sawing, said endless belt-shaped printing plate is formed of an elongated resinous relief printing plate (27, 27A) having a thickness less than 1 mm and a length of 5 m - 9 m and including abutting or joined ends each having an unevenness pattern engaged with each other and bonded with a one-side adhesive tape applied from the printing surface side, whereby the printing apparatus provides a resinous relief printing at a high-resolution of micro-characters at a size of 0.5 to 0.3 point and/or photograph printing at 175 - 300 lines on the continuous form. a plate cylinder (16, 18), a guide roller and the endless belt-shaped printing plate wound about the plate cylinder (16, 18) and the guide roller for printing on a continuous form supplied between the plate cylinder (16, 18) and an impression cylinder, wherein said plate cylinder (16, 18) is provided with feed pins which are disposed in rows at an even pitch along an outer periphery of the plate cylinder at both ends in the axial direction of the plate cylinder so as to project and retract freely and guided by a fixed cam ring and so as to project out of the plate cylinder surface in a region forming a central angle of at least 150 degrees of the plate cylinder opposite to the guide roller of the plate cylinder, said endless belt-shaped printing plate is provided with pin feed holes at marginal zones at both sides in a width direction of the endless belt-shaped printing plate so that the pin feed holes are disposed in rows along the longitudinal direction of the endless belt-shaped printing plate at an even pitch which is identical to the pitch of said feed pins, said pin feed holes formed at the marginal zones of the endless belt-shaped printing plate are engaged with said feed pins of the plate cylinder, thereby guiding the movement of the endless belt-shaped printing plate, each feedpin comprises a pinhead engageable with one of the pin feed holes formed in the marginal zones of the endless belt-shaped printing plate, and a cam slot engageable with the fixed cam ring, and said fixed cam ring has a diameter smaller than that of the plate cylinder (16, 18) and a center which is shifted to a side opposite to the guide roller from the axial center of the plate cylinder (16, 18), characterized in that said plate cylinder (16, 18) and impression cylinder are composed not as a hollow cylinder but as solid cylinders formed by filing or sawing, said endless belt-shaped printing plate is formed of an elongated resinous relief printing plate (27, 27A) having a thickness less than 1 mm and a length of 5 m - 9 m and including abutting or joined ends each having an unevenness pattern engaged with each other and bonded with a one-side adhesive tape applied from the printing surface side, whereby the printing apparatus provides a resinous relief printing at a high-resolution of micro-characters at a size of 0.5 to 0.3 point and/or photograph printing at 175 - 300 lines on the continuous form.