This paper has proposed a swallowable medical capsule with a magnetically driven biopsy forceps. The biopsy unit is composed of a biopsy forceps and a lead screw actuator with a permanent magnet. When a rotating magnetic field is externally applied, the forceps is projected from a front of the capsule by the lead screw actuator. When the magnetic field is further continuously applied, the forceps is opened at a lesion. Then, by applying the rotating magnetic field reversely, the forceps is closed to collect the tissue and withdrawn into the capsule. This report describes the basic structure, actuation principle and successful operation results by the prototype.