A printing apparatus is composed in a constitution in which the conveying path P2 of printing paper P being from the confronting position of the platen roller 6 and thermal head 7 for composing the printing unit 3 to the paper discharge unit 2 is nearly linear, the capstan roller 4, pinch roller 5, and discharge rollers 10, 10 are disposed opposedly to the conveying path P2, and an intermediate position of the conveying path P2 is joined with the conveying path P1 being from the paper feed unit 1 to the printing unit 3, and a paper feed port is disposed at the bottom of the paper cassette for composing the paper feed unit 1, so that the conveying path P1 being from the paper feed port to the printing unit 3 is shortened, and accordingly the paper conveying path is shortened, the constitution is simplified and downsized, while the precision of positioning of the printing paper and positioning of the printing head is enhanced, so that the printing quality may be improved.