The present invention is intended to provide a tissue biopsy needle apparatus equipped with a protective cover which prevents a needle tube from being ejected unnecessarily when an urging member is compressed in preparation for ejection of the needle tube. For that, the tissue biopsy needle apparatus includes a spring 28 which ejects the needle tube 26 a drawing unit which draws the spring 28 to a compressed position, the drawing unit including a drawing knob 20 and a drawing tube 29 an operation switch 24 which causes the drawing unit to draw and hold the spring 28 at the compressed position and causes the spring 28 to be released from the compressed position, thereby ejecting the needle tube 26 a protective cover 23 which disables the operation switch 24 when the spring 28 is drawn and held at the compressed position and an elastic tongue 23c and an abutting strip 29b which move the protective cover 23 from a working position to a non-working position of the operation switch 24 in accordance with drawing of the spring 28 to the compressed position by the drawing unit, the elastic tongue 23c being installed on the protective cover and the abutting strip 29b being installed on the drawing tube 29.
