A printer cover locking mechanism comprising: a printer housing; an opening and closing cover configured to open and close with respect to the printer housing; a print head attached to one of: the printer housing or the opening and closing cover, the print head capable of printing on print paper loaded into the printer housing; a platen roller attached to another of: the printer housing or the opening and closing cover, the platen roller capable of feeding the print paper by rotating while sandwiching the print paper between the print head and the platen roller; a cover lock configured to cause the print head to contact with the platen roller by engaging with the platen roller and configured to cause the print head to separate from the platen roller by disengaging from the platen roller, the cover lock attached to the print head, the cover lock allowing dissipation of heat generated from the print head; and a push-release button to be operated to separate the print head from the platen roller; characterized in that the printer cover locking mechanism further comprises an abutting inclined plate that opposes the push-release button, the abutting inclined plate is integrally formed with the cover lock; the abutting inclined plate of the cover lock inclines in a direction that approaches a rear surface side of the push-release button; the inclined abutting plate and the push-release button are not connected to each other when the opening and closing cover is closed and the push-release button is not operated; the push-release button when operated rotates with respect to the printer housing; and the push-release button is suitable for abutting against the inclined abutting plate so that the cover lock rotates to separate the print head from the platen roller. a printer housing; an opening and closing cover configured to open and close with respect to the printer housing; a print head attached to one of: the printer housing or the opening and closing cover, the print head capable of printing on print paper loaded into the printer housing; a platen roller attached to another of: the printer housing or the opening and closing cover, the platen roller capable of feeding the print paper by rotating while sandwiching the print paper between the print head and the platen roller; a cover lock configured to cause the print head to contact with the platen roller by engaging with the platen roller and configured to cause the print head to separate from the platen roller by disengaging from the platen roller, the cover lock attached to the print head, the cover lock allowing dissipation of heat generated from the print head; and a push-release button to be operated to separate the print head from the platen roller; characterized in that the printer cover locking mechanism further comprises an abutting inclined plate that opposes the push-release button, the abutting inclined plate is integrally formed with the cover lock; the abutting inclined plate of the cover lock inclines in a direction that approaches a rear surface side of the push-release button; the inclined abutting plate and the push-release button are not connected to each other when the opening and closing cover is closed and the push-release button is not operated; the push-release button when operated rotates with respect to the printer housing; and the push-release button is suitable for abutting against the inclined abutting plate so that the cover lock rotates to separate the print head from the platen roller.