Coil device

A coil device comprising:

• a core comprising a winding core part, a first flange part at an axial end part of the winding core part, and a second flange part at another axial end part of the winding core part,
• a coil part in which a first wire and a second wire are wound around the winding core part,
• a first terminal electrode, on a mounting surface of the first flange part and connected to one lead-out part of the first wire,
• a second terminal electrode, on the mounting surface of the first flange part spaced apart from the first terminal electrode and connected to one lead-out part of the second wire,
• a third terminal electrode, on the mounting surface of the second flange part and connected to a second lead-out part of the second wire, and
• a fourth terminal electrode, on the mounting surface of the second flange part spaced apart from the third terminal electrode and connected to a second lead-out part of the first wire, wherein
• the first flange part comprises a concave part and a wall,
• a bottom surface of the concave part is located closer to one of the first terminal electrode and the second terminal electrode than to another of the first terminal electrode and the second terminal electrode between the first terminal electrode and the second terminal electrode, and
• the wall includes opposite side surfaces defined by the inner edge surface of the flange part and the concave part and extends upwardly from the bottom surface of the concave part between the concave part and the inner edge surface of the flange part.

A core comprising:

• a winding core part and
• a flange part provided at an axial end part of the winding core part, wherein
• the flange part comprises a concave part and a wall,
• when viewed from a direction parallel to the axial direction of the winding core part, a bottom surface of the concave part is located closer to one end of the flange part than the other end of the flange part, and
• the wall includes opposite side surfaces defined by the inner edge surface of the flange part and the concave part and extends upwardly from the bottom surface of the concave part between the concave part and the inner edge surface of the flange part.