Coil device

A coil device comprising

• a core,
• a first collar part and a second collar part each provided at both sides along the axis direction of the core,
• a coil part at least having a first wire and a second wire which are wound around the core,
• a first terminal connected with one lead part of the first wire and provided to the first collar part,
• a second terminal connected with one lead part of the second wire and provided apart from the first terminal to the first collar part,
• a third terminal connected with other lead part of the first wire and provided to the second collar part,
• a fourth terminal connected with other lead part of the second wire and provided apart from the third terminal to the second collar part, wherein
• the one lead part of the first wire heading towards the coil part from the first terminal and the one lead part of the second wire heading towards the coil part from the second terminal are placed in close proximity at least between the coil part and an inner face of the first collar part, and
• the first wire and the second wire form a crossing part of which the first wire and the second wire are crossing against each other in the middle of the core.