A printing apparatus, comprising: a support member configured to support a core body (Ra) of a roll medium formed by winding a print medium around the core body in a roll shape; a transport mechanism configured to transport the elongated print medium drawn out from the roll medium along a transport path; a first accommodation sidewall and a second accommodation sidewall that constitute a part of an accommodation section configured to accommodate the roll medium and that are disposed to face each other in a width direction, which intersects a transport direction of the print medium; a print head configured to print an image on the print medium; a trailing edge detection section configured to detect that all of the print medium that is drawable out from the roll medium has been drawn out by the transport mechanism; and a control section configured to determine, when the trailing edge detection section detects that the support member is separated from the engagement surface, that all of the print medium that is drawable out from the roll medium has been drawn out by the transport mechanism, wherein the first accommodation sidewall has a groove, and the roll medium is accommodated in the accommodation section by the support member engaging with the groove and the trailing edge detection section detects that the support member separated from an engagement surface of the groove, and wherein: the transport mechanism has a drive roller, a guide member configured to guide the print medium is provided between the support member and the drive roller in the transport path, and the guide member contacts the print medium and bends the advancing direction of the print medium, thereby applying tension to the print medium. a support member configured to support a core body (Ra) of a roll medium formed by winding a print medium around the core body in a roll shape; a transport mechanism configured to transport the elongated print medium drawn out from the roll medium along a transport path; a first accommodation sidewall and a second accommodation sidewall that constitute a part of an accommodation section configured to accommodate the roll medium and that are disposed to face each other in a width direction, which intersects a transport direction of the print medium; a print head configured to print an image on the print medium; a trailing edge detection section configured to detect that all of the print medium that is drawable out from the roll medium has been drawn out by the transport mechanism; and a control section configured to determine, when the trailing edge detection section detects that the support member is separated from the engagement surface, that all of the print medium that is drawable out from the roll medium has been drawn out by the transport mechanism, wherein the first accommodation sidewall has a groove, and the roll medium is accommodated in the accommodation section by the support member engaging with the groove and the trailing edge detection section detects that the support member separated from an engagement surface of the groove, and wherein: the transport mechanism has a drive roller, a guide member configured to guide the print medium is provided between the support member and the drive roller in the transport path, and the guide member contacts the print medium and bends the advancing direction of the print medium, thereby applying tension to the print medium. the transport mechanism has a drive roller, a guide member configured to guide the print medium is provided between the support member and the drive roller in the transport path, and the guide member contacts the print medium and bends the advancing direction of the print medium, thereby applying tension to the print medium.