Reactor

A reactor comprising a coil, a holding member and a magnetic core, wherein:

• the coil has a winding portion;
• the winding portion is wound about a single center axis which extends along a front-rear direction;
• the winding portion is partially embedded in the holding member;
• the magnetic core is a gapless core;
• the magnetic core has a middle leg and two outer portions;
• each of the outer portions has an outer leg and two coupling portions;
• the middle leg is enclosed by the winding portion in a vertical plane perpendicular to the front-rear direction;
• the winding portion is located between the two outer legs in a lateral direction perpendicular to the front-rear direction;
• for each of the outer portions, the coupling portions couple opposite ends of the outer leg in the front-rear direction to opposite ends of the middle leg in the front-rear direction, respectively;
• the holding member has an upper front support portion, an upper rear support portion and an outer wall;
• the upper front support portion is located forward of the winding portion and is in contact with an upper surface of the magnetic core in an upper-lower direction perpendicular to both the front-rear direction and the lateral direction;
• the upper rear support portion is located rearward of the winding portion and is in contact with the upper surface of the magnetic core;
• the outer wall is in contact with an external surface of the magnetic core in a horizontal plane perpendicular to the upper-lower direction;
• the holding member is provided with a fastening portion for fastening the reactor on an object;
• and
• the fastening portion is integrally formed with the holding member.