The invention relates to a business machine which comprises a seat body, a supporting piece, a first limit piece and a first roller group. The seat body is provided with an acting surface, and the acting surface is provided with a first end point. An acting point is defined on the supporting piece. The first limit piece is arranged at the first side of the seat body and is provided with a first limit point and a second limit point. The first roller group is also arranged at the first side of the seat body and is provided with a first clamping and pressing point. The second limit point is not lower than the first end point, and the acting point is positioned between the first end point and the first limit point, the first limit point is positioned between the acting point and the first clamping and pressing point. The invention can effectively prevent paper from vibrating during the conveying.