Touch pen and display device using touch pen

A touch pen of a pen-type electronic input device comprising:

• a cylindrical-shaft-shaped body;
• a pen tip used to input information and provided on a front end of the body;
• a switch used to perform operations and arranged in a line on a side face of the body;
• a battery disposed inside the body;
• and
• a cylindrical-tube-shaped barrel in which a slit having a front opening is formed in an axial direction,
• a battery lid of the side face of a housing of the body, wherein
• an outer face of the body comprises a cylindrical outer surface,
• an inner face of the barrel comprises a cylindrical inner surface,
• a back end of the body is inserted from the front opening of the barrel such that the cylindrical inner surface of the inner face of the barrel contacts and covers the cylindrical outer surface of the outer face of the body with the switch positioned in the slit, and the barrel has a center of gravity on an opposite side of the slit as seen in a transverse cross-section,
• in a case of the touch pen being placed horizontally in a state in which the barrel is mounted on the outer face of the body, the center of gravity is positioned on the opposite side of the switch and the switch is positioned on top, and
• the battery is provided inside the housing of the body in a central part in an axial direction of the body, structured such that in the housing, the battery lid is removable from the side face of the barrel to allow the battery to be inserted or removed under the condition that the barrel is removed from the body.