A booklet printing apparatus provided with a page flipping mechanism, comprising: a central processing unit that is configured to control the booklet printing apparatus; wherein the page flipping mechanism includes at least an insertion/ejection feeding roller (25a, 25b), an intermediate feeding roller (28a, 28b), an inner feeding roller (31a, 31b), a flipping roller arranged coaxially with the intermediate feeding roller and rotated by a dedicated motor independently from the intermediate feeding roller, and a lifting member arranged below a surface of a feeding route between the intermediate feeding roller and the inner feeding roller, the insertion/ejection feeding roller (25a, 25b) causes a booklet to be inserted with a first line of a printing field on facing pages first, the intermediate feeding roller (28a, 28b) takes up a feed of the inserted booklet, and the inner feeding roller (31a, 31b) takes over feeding of the booklet and pulls the booklet inside, characterized in that the central processing unit is configured to control a process in which: the lifting member lifts a portion in which a page to be flipped of the facing pages of the booklet is present up to a height of 5mm to 8.5mm from a bottom, the dedicated motor rotates at a speed to rotate the flipping roller at a speed of 9.6 rad/sec or less and to generate cogging, and the flipping roller flips the page to be flipped by a rotation speed of 3.2 rad/sec to 9.6 rad/sec while propagating vibration of cogging of the dedicated motor to the page to be flipped. a central processing unit that is configured to control the booklet printing apparatus; wherein the page flipping mechanism includes at least an insertion/ejection feeding roller (25a, 25b), an intermediate feeding roller (28a, 28b), an inner feeding roller (31a, 31b), a flipping roller arranged coaxially with the intermediate feeding roller and rotated by a dedicated motor independently from the intermediate feeding roller, and a lifting member arranged below a surface of a feeding route between the intermediate feeding roller and the inner feeding roller, the insertion/ejection feeding roller (25a, 25b) causes a booklet to be inserted with a first line of a printing field on facing pages first, the intermediate feeding roller (28a, 28b) takes up a feed of the inserted booklet, and the inner feeding roller (31a, 31b) takes over feeding of the booklet and pulls the booklet inside, characterized in that the central processing unit is configured to control a process in which: the lifting member lifts a portion in which a page to be flipped of the facing pages of the booklet is present up to a height of 5mm to 8.5mm from a bottom, the dedicated motor rotates at a speed to rotate the flipping roller at a speed of 9.6 rad/sec or less and to generate cogging, and the flipping roller flips the page to be flipped by a rotation speed of 3.2 rad/sec to 9.6 rad/sec while propagating vibration of cogging of the dedicated motor to the page to be flipped. the lifting member lifts a portion in which a page to be flipped of the facing pages of the booklet is present up to a height of 5mm to 8.5mm from a bottom, the dedicated motor rotates at a speed to rotate the flipping roller at a speed of 9.6 rad/sec or less and to generate cogging, and the flipping roller flips the page to be flipped by a rotation speed of 3.2 rad/sec to 9.6 rad/sec while propagating vibration of cogging of the dedicated motor to the page to be flipped.