Walk-behind, self-propelled working machine

A walk-behind, self-propelled working machine, comprising:

• a body;
• a drive source provided at said body;
• a pair of driving wheels provided at said body and driven by said drive source;
• a working tool provided at said body and driven by said drive source;
• a continuously variable transmission interposed between said drive source and said pair of driving wheels;
• an operating handle extending from a rear end of said body in a rearward and upward direction;
• an operation switching lever provided at said handle, for transmitting or interrupting driving force outputted from said drive source to said working tool;
• a drive switching lever provided at said handle, for operating said continuously variable transmission in order to switch said pair of driving wheels from a halt condition to a high-speed advancement condition;
• and
• a speed adjusting rotary control for adjusting said continuously variable transmission in order to adjust the rotational speed of said driving wheels,
• said operation switching lever and said drive switching lever being independently provided in the vicinity of a grip of said handle;
• and said speed adjusting rotary control is provided on one side of said handle in the vicinity of said drive switching lever.