Wiper device for vehicle

A vehicle wiper device, comprising:

• a first driving lever having a distal end and a proximal end, the proximal end being pivotal about a first axis located at a fixed position in relation to a vehicle body;
• a second driving lever having a distal end and a proximal end, the proximal end being pivotal about a second axis located at a fixed position in relation to the vehicle body;
• a first driven lever having a distal end and a proximal end, the proximal end being pivotally connected to the distal end of the first driving lever about a third axis;
• a second driven lever having a proximal end and a distal end, the proximal end being pivotally connected to the distal end of the first driven lever about a fourth axis, and the distal end being pivotally connected to the distal end of the second driving lever about a fifth axis;
• a first wiper blade that reciprocally wipes a wiped surface between upper and lower reversal positions of the wiped surface;
• a first wiper arm configured to operate integrally with the second driven lever and having a distal end to which the first wiper blade is connected;
• a swing transmission mechanism configured to transmit a driving force to the first driving lever, the swing transmission mechanism including a swing crank arm rotated by a driving force of a single drive source;
• an extension-contraction transmission mechanism configured to transmit a driving force to the second driving lever, the extension-contraction transmission mechanism including an extension-contraction crank arm;
• and
• a rotation speed conversion transmission member connecting and driving the extension-contraction crank arm and the swing crank arm so that the extension-contraction crank arm rotates at a rotation speed two times greater than a rotation speed of the swing crank arm.