Printed wiring board

A printed wiring board comprising:

• a power supply layer including a conductor portion located on a power supply path and having a first end and a second end that face each other,
• a first conductor connection portion connected to the first end on the path and protruding from the first end in a direction away from the conductor portion, and
• a second conductor connection portion connected to the second end on the path and protruding from the second end in a direction away from the conductor portion,
• wherein the conductor portion consists of a first region interposed between the first end and the second end, and a second region and a third region located opposite each other and in contact with portions of the first region that are not in contact with the first conductor connection portion and the second conductor connection portion, and
• the second region and the third region each have an identical shape obtained by dividing a regular polygon having an even number of sides of 16 or more or a circle in half through a center of the regular polygon or the circle.