Composite electronic component

A composite electronic component comprising:

• a first electronic element;
• a second electronic element mounted on the first electronic element in a height direction;
• and
• a joint material joining the first electronic element and the second electronic element;
• wherein
• the first electronic element functions as a passive element and includes an insulating base member including an upper surface intersecting with the height direction, and an upper surface conductor disposed on the upper surface of the base member;
• the second electronic element includes an element body including a lower surface facing the upper surface of the base member in the height direction, and a terminal conductor disposed on at least a portion of the lower surface of the element body;
• the joint material joins at least a portion of the upper surface conductor and at least a portion of the terminal conductor;
• the upper surface conductor includes a conductive layer containing Ag or Cu as a metal component that is maximum in weight ratio;
• at least a portion of the lateral surface of the conductive layer is covered with a protective metal film;
• and
• the metal component that is maximum in weight ratio contained in the protective metal film is a metal other than Ag and Cu.