The disclosure discloses an adhesive tape cartridge (TK) comprising an adhesive tape roll (R1) around which an adhesive tape (150), which comprises an adhesive layer (152) and a separation material layer (151) that covers the adhesive layer (152), is wound about an axis line (O1) in the substantially horizontal direction, a separation material roll (R3) configured to wind the separation material layer (151) around an axis line (03) in the substantially horizontal direction, the separation material layer (151) being peeled from the adhesive tape (150') fed out from the adhesive tape roll (R1) and fed, a connecting arm (21) that freely rotatably supports the adhesive tape roll (R1) on one side in the horizontal direction and freely rotatably supports the separation material roll (R3) on the other side in the horizontal direction, provided so as to connect the adhesive tape roll (R1) and the separation material roll (R3), and guide means (27) configured to cause the adhesive tape (150) fed from the adhesive tape roll (R1) to pass in a tape posture with a tape cross-section set to a substantially horizontal direction, substantially contact both tape width direction ends during the passing, and to guide the adhesive tape (150) in the tape width direction, provided in a middle part of the connecting arm (21), between the adhesive tape roll (R1) and the separation material roll (R3) along a feeding path of the adhesive tape (150).