A medical manipulator comprising: a plurality of arms (152, 153) formed in a cylindrical shape, a distal end portion of which is made of a rigid member having a first bending portion (154, 155) capable of bending, an insertion portion made of a rigid member having a plurality of channels in which base ends of the plurality of arms (152, 153) are connected to a distal end of the insertion portion so as to connect lumens of the arms (152, 153) to the plurality of channels, a photographic device provided at the distal end of the insertion portion, a first bending operation portion (171, 172) configured to operate the first bending portion (154, 155), four transmission members (181, 182) that connect the first bending portion (154, 155) and the first bending operation portion (171, 172), a second bending portion (156, 157) provided closer to a base end of the arms (152, 153) than the first bending portion (154, 155) and being capable of fixing the plurality of arms (152 153) in a bent state such that the plurality of arms (153, 153) mutually separate, and a second bending operation portion (173, 174) configured to operate the second bending portion (156, 157) and being connected to the second bending portion (156, 157) via the four transmission members (181, 182), characterized in that the four transmission members (181, 182) have: a first region (181A, 182A) which is flexible, and a second region (181B, 182B) which is rigid and connected to a base end portion of the first region (181A, 182A), the first bending operation portion (171, 172) and the four transmission members (181, 182) are connected via a plurality of operation portion links (188, 189); and a distance between the plurality of operation portion links (188, 189) at a position where the plurality of operation portion links (188, 189) is connected to the first bending operation portion (171, 172) is longer than a distance between the plurality of operation portion links (188, 189) at a position where the plurality of operation portion links (188, 189) is connected to the four transmission members (181, 182). a plurality of arms (152, 153) formed in a cylindrical shape, a distal end portion of which is made of a rigid member having a first bending portion (154, 155) capable of bending, an insertion portion made of a rigid member having a plurality of channels in which base ends of the plurality of arms (152, 153) are connected to a distal end of the insertion portion so as to connect lumens of the arms (152, 153) to the plurality of channels, a photographic device provided at the distal end of the insertion portion, a first bending operation portion (171, 172) configured to operate the first bending portion (154, 155), four transmission members (181, 182) that connect the first bending portion (154, 155) and the first bending operation portion (171, 172), a second bending portion (156, 157) provided closer to a base end of the arms (152, 153) than the first bending portion (154, 155) and being capable of fixing the plurality of arms (152 153) in a bent state such that the plurality of arms (153, 153) mutually separate, and a second bending operation portion (173, 174) configured to operate the second bending portion (156, 157) and being connected to the second bending portion (156, 157) via the four transmission members (181, 182), characterized in that the four transmission members (181, 182) have: a first region (181A, 182A) which is flexible, and a second region (181B, 182B) which is rigid and connected to a base end portion of the first region (181A, 182A), a first region (181A, 182A) which is flexible, and a second region (181B, 182B) which is rigid and connected to a base end portion of the first region (181A, 182A), the first bending operation portion (171, 172) and the four transmission members (181, 182) are connected via a plurality of operation portion links (188, 189); and a distance between the plurality of operation portion links (188, 189) at a position where the plurality of operation portion links (188, 189) is connected to the first bending operation portion (171, 172) is longer than a distance between the plurality of operation portion links (188, 189) at a position where the plurality of operation portion links (188, 189) is connected to the four transmission members (181, 182).