To allow remote operation, and use electric signals to control rotation of driving motors thereby enabling control of multiple input and output signals and reduction in the parts count.SOLUTION: A self-propelled working machine comprises: a traveling unit D that is disposed on a machine body L on left and right sides in the direction of travel and has traveling motors 15 to cause driven travel; a working unit K that is positioned in front of the machine body L and the traveling unit D and has multiple working motors 51 for working; a lifting unit F with a lifting arm 43 and a lifting motor 61 that enable the working unit K to be lifted up and down; an operating unit B for operating the traveling unit D, the working unit K and the lifting unit F; and a converter control device E to convert signals transmitted from the operating unit B and to output signals for controlling rotation of the traveling motors 15, the working motors 51 and the lifting motor 61.SELECTED DRAWING: Figure 1【課題】 遠隔操作を行うとともに、駆動用モータの回転制御を電気信号で行うことで複数の入出力信号の制御を可能にし、且つ、部品点数を減らすことができる。【解決手段】 機体Lの進行方向左右側に設けられ駆動走行をさせる走行モータ15を有した走行部Dと、前記機体L及び前記走行部Dの前方に位置させて作業をするための複数の作業モータ51を備えた作業部Kと、前記作業部Kを昇降自在にする昇降アーム43及び昇降モータ61を備えた昇降部Fと、前記走行部D及び前記作業部K及び前記昇降部Fを操作するための操作部Bと、該操作部Bから送られた信号を変換し、前記走行モータ15及び前記作業モータ51及び前記昇降モータ61の回転を制御するため信号を出力する変換部制御装置Eと、を備えた自走式作業機。【選択図】図1