Circuit structure, electrical connection box, and method for manufacturing circuit structure

A circuit structure (20) is provided with: a circuit board (21) in which a conductive path and a through-hole (22) electrically connected to the conductive path are formed; a coil device (50) provided with a coil (51) having a terminal part (52), and a core (54) of a magnet; a heat dissipation member (30) having a housing recess (34) for housing the coil device (50), the heat dissipation member (30) having the circuit board (21) overlaid thereon; and grease (25) in contact with the inner surface of the housing recess (34) and the coil device (50), the terminal portion (52) of the coil device (50) being inserted through and soldered to the through hole (22). 电路结构体(20)具备：电路基板(21)，形成有导电通路和与导电通路电连接的通孔(22)；线圈装置(50)，具备线圈(51)和磁体的芯(54)，该线圈(51)具有端子部(52)；散热构件(30)，具有收容线圈装置(50)的收容凹部(34)，并且在所述散热构件(30)上重叠电路基板(21)；及润滑脂(25)，与收容凹部(34)的内表面和线圈装置(50)接触，线圈装置(50)中的端子部(52)插通并软钎焊于通孔(22)。