Vertical articulated robot

A vertical articulated robot, comprising:

• a first arm;
• a wrist unit, to which the first arm is coupled, including a first hand and a second hand;
• a wrist axis that is positioned in a direction orthogonal to a direction in which the first arm extends, about which the wrist unit is rotatable;
• a first hand axis, to which the wrist unit is coupled, positioned in a direction orthogonal to the wrist axis, about which the first hand is rotatable;
• a second hand axis, to which the wrist unit is coupled, about which the second hand is coaxially rotatable with the first hand axis;
• a wrist axis motor, a first hand axis motor, and a second hand axis motor, functioning as drive sources for the wrist axis, the first hand axis, and the second hand axis, which are housed in the first arm and are arranged in parallel;
• a first intermediate axis, which is coaxially positioned with the wrist axis and is operatable due to a driving force from the first hand axis motor;
• a first gear, on which the first intermediate axis is journaled;
• a second gear, on which the first hand axis is coaxially journaled, which is in mesh with the first gear;
• a second intermediate axis, which is coaxially positioned with the wrist axis and first intermediate axis and is operatable due to a driving force from the second hand axis motor;
• a third gear, on which the second intermediate axis is journaled;
• and
• a fourth gear, on which the second hand axis is journaled, which is in mesh with the third gear.