A medical apparatus includes: an image pickup apparatus introduced and retained in a body; a retaining/fixing section which contacts a body wall in the body, for retaining and fixing the image pickup apparatus at the body wall; plural operation wires operated from an extracorporeal side; and an observation direction control section which changes an observation direction of the image pickup apparatus by operation of the plural wires, and includes: an image pickup apparatus fixing section connected to the operation wires, which contacts an outer surface part of the image pickup apparatus; and a rotary section for supporting the retaining/fixing section and the image pickup apparatus fixing section so as to be separated from each other by a predetermined distance, and allowing the image pickup apparatus fixing section to rotate with respect to the retaining/fixing section with a rotation center as a fulcrum, based on operation of the plural operation wires.