Sheet Material Punching Device

A sheet material punching device, comprising:

• a punching pin driven so as to reciprocate on a sheet material being transported;
• a die member having die holes to form punched holes jointly with the punching pin in the sheet material placed thereon in a thickness direction of the sheet material;
• a frame having wall portions respectively provided on an upstream side and a downstream side in a transport direction of the sheet material, the die member and the punching pin being provided in a space between the wall portion on the upstream side and the wall portion on the downstream side, the frame further having a longitudinal direction extending in a width direction of the sheet material;
• and
• paper feed ports respectively formed in side plate portions on both sides of a center plate portion of the die member formed in an H-like shape in cross section and having the die holes in the center plate portion thereof, the paper feed ports being provided for the sheet material to be transported through and placed on the center plate portion, wherein
• the side plate portions on the both sides of the die member are joined with the wall portions of the frame in order for the die member and the frame to be integral with each other.