Coil device and manufacturing method thereof

The invention provides a coil device with excellent inductance characteristics and a manufacturing method thereof. A coil device (1) has a core (2); a coil (3) having a winding part (30) disposed inside the core (2) and a lead-out part (5a) led out from the winding part (30); and a terminal (4a) having a wiring part (40a) that is joined to the lead-out part (5a) and that is disposed inside the core (2). The lead-out section (5a) has a joining section (50a) joined to the wiring section (40a) and a non-joining section (51a) separated from the joining section (50a). The first thickness (L1) of the joining part (50a) is smaller than the second thickness (L2) of the non-joining part (51a). 本发明提供电感特性优异的线圈装置及其制造方法。线圈装置(1)具有芯(2)；线圈(3)，其具有配置于芯(2)的内部的卷绕部(30)和从卷绕部(30)引出的引出部(5a)；以及端子(4a)，其具有与引出部(5a)接合且配置于芯(2)的内部的接线部(40a)。引出部(5a)具有与接线部(40a)接合的接合部(50a)和与接合部(50a)分离的非接合部(51a)。接合部(50a)的第一厚度(L1)小于非接合部(51a)的第二厚度(L2)。