PURPOSE: To make dialing from a seated position in an extent that a hand reaches a telephone set by forming a projection section pressing various buttons on a handset main body used for the telephone set main body provided with various buttons.

CONSTITUTION: Projections 24, 25 pressing various buttons 15-17 are formed on a receiver main body 1 used for a telephone set main body 10 provided with various buttons such as dial button 15, a function button 16 and an external line button 17 or the like. The projections 24, 25 are provided to a button operation member 20 freely attachable/detachable on the handset main body 1 and a foamed resin 26 ensuring the holding-between retaining and coming into contact with a surface of the handset main body 1 is sticked on the inside of a holding between retaining member 23 of the button operation member 20 and the projections 24, 25 made of other material and a resin simulating a finger of a person are provided to an upper side surface of a side surface part 22 of the member 23. Then the handset main body 1 is lifted up from the telephone set main body 10 and the various buttons 15-17 are aimed and depressed by the projections 24, 25.