An electronic circuit component mounting head (10; 110) comprising: a head main body ; a raising/lowering member which is guided on the head main body (12; 112) as to be capable of being raised/lowered; a first raising/lowering driving device (18; 140) configured to raise/lower the raising/lowering member with respect to the head main body (12; 112); a component holding tool (22; 100) configured to hold an electronic circuit component and is held as to be capable of being raising/lowered relative to the raising/lowering member by the raising/lowering member ; a second raising/lowering driving device (60. 66) configured to raise/lower the component holding tool (22; 100) relative to the raising/lowering member ; and a biasing means provided between the raising/lowering member and the component holding tool (22; 100), the biasing means biases the component holding tool (22; 100) either up or down relative to the raising/lowering member , wherein the second raising/lowering driving device is configured to engage with the component holding tool (22; 100) against the biasing force of that biasing means without acting via an elastic member, and in that state, the second raising/lowering driving device is configured to mount an electronic circuit component on a circuit substrate, characterized in that the second raising/lowering driving device (60. 66) is configured to be raised/lowered by the first raising/lowering driving device together with the raising/lowering member , and the second raising/lowering driving device is provided outside of the raising/lowering member and the component holding tool (22; 100) and which includes a holding tool engaging section which is configured to engage with the component holding tool (22; 100). a head main body ; a raising/lowering member which is guided on the head main body (12; 112) as to be capable of being raised/lowered; a first raising/lowering driving device (18; 140) configured to raise/lower the raising/lowering member with respect to the head main body (12; 112); a component holding tool (22; 100) configured to hold an electronic circuit component and is held as to be capable of being raising/lowered relative to the raising/lowering member by the raising/lowering member ; a second raising/lowering driving device (60. 66) configured to raise/lower the component holding tool (22; 100) relative to the raising/lowering member ; and a biasing means provided between the raising/lowering member and the component holding tool (22; 100), the biasing means biases the component holding tool (22; 100) either up or down relative to the raising/lowering member , wherein the second raising/lowering driving device is configured to engage with the component holding tool (22; 100) against the biasing force of that biasing means without acting via an elastic member, and in that state, the second raising/lowering driving device is configured to mount an electronic circuit component on a circuit substrate, characterized in that the second raising/lowering driving device (60. 66) is configured to be raised/lowered by the first raising/lowering driving device together with the raising/lowering member , and the second raising/lowering driving device is provided outside of the raising/lowering member and the component holding tool (22; 100) and which includes a holding tool engaging section which is configured to engage with the component holding tool (22; 100). <EOS>