An operation panel device for an elevator, comprising: a faceplate having an opening portion; and a switch including: a switch main body mounted onto the faceplate; and an operation portion provided to the switch main body, the operation portion being exposed on a surface side of the faceplate through the opening portion, wherein: a retaining mechanism for retaining the switch main body in a predetermined mounting position is provided between a side surface of the switch main body and a back surface of the faceplate; and the retaining mechanism includes a pair of elastic members for allowing the switch main body to be moved to the mounting position by elastic deformation and for being restored to an original state to prevent the switch main body from moving from the mounting position when the switch main body is moved to the mounting position; characterized by a pair of retaining members each having an L-shaped cross section, the retaining members facing each other with the opening portion sandwiched therebetween; wherein on surfaces of the retaining members, which are opposed to each other, slit-forming members are respectively provided, each for forming a slit with a corresponding one of the retaining members; said elastic members being inserted into sid slits; wherein side surfaces of the switch main body respectively abut against the slit-forming members. a faceplate having an opening portion; and a switch including: a switch main body mounted onto the faceplate; and an operation portion provided to the switch main body, the operation portion being exposed on a surface side of the faceplate through the opening portion, wherein: a retaining mechanism for retaining the switch main body in a predetermined mounting position is provided between a side surface of the switch main body and a back surface of the faceplate; and the retaining mechanism includes a pair of elastic members for allowing the switch main body to be moved to the mounting position by elastic deformation and for being restored to an original state to prevent the switch main body from moving from the mounting position when the switch main body is moved to the mounting position; characterized by a pair of retaining members each having an L-shaped cross section, the retaining members facing each other with the opening portion sandwiched therebetween; wherein on surfaces of the retaining members, which are opposed to each other, slit-forming members are respectively provided, each for forming a slit with a corresponding one of the retaining members; said elastic members being inserted into sid slits; wherein side surfaces of the switch main body respectively abut against the slit-forming members. a retaining mechanism for retaining the switch main body in a predetermined mounting position is provided between a side surface of the switch main body and a back surface of the faceplate; and the retaining mechanism includes a pair of elastic members for allowing the switch main body to be moved to the mounting position by elastic deformation and for being restored to an original state to prevent the switch main body from moving from the mounting position when the switch main body is moved to the mounting position; characterized by a pair of retaining members each having an L-shaped cross section, the retaining members facing each other with the opening portion sandwiched therebetween; wherein on surfaces of the retaining members, which are opposed to each other, slit-forming members are respectively provided, each for forming a slit with a corresponding one of the retaining members; said elastic members being inserted into sid slits; wherein side surfaces of the switch main body respectively abut against the slit-forming members.