A first passive component (10A) includes one unbalanced line (14) having one unbalance input terminal (12), one balanced line (18) installed opposite to the unbalanced line (14) and having two balanced output terminals (first balanced output terminal (16a) and second balanced output terminal (16b)), and a capacitor (20) formed between the balanced line (18) and a fixed potential (e.g. the ground potential). Furthermore, the relation d1>d2 is satisfied, where d1 is the physical length of the unbalanced line (14) and d2 is the physical length of the balanced line (18).