An inductance element and a case; the inductance element, comprising a winding type magnetic core having a hollow part formed by winding a magnetic ribbon thereon and a lead having a cross sectional dimension smaller than the inner diameter of the hollow part of the magnetic core and passing the hollow part, wherein a clearance is provided between the magnetic core and the lead; the case, comprising a plurality of members combined with each other, wherein the members are connected to each other in a surface including one or more case ridge lines.