Liquid level detecting apparatus and method for manufacturing the same

Liquid level detecting device (1) for detecting a liquid level contained in a tank, comprising: a first member (2, 3) which moves in a prescribed manner, when the liquid level changes; a field device (6) for forming a magnetic field; an electronic circuit (70) for generating an electrical signal in response to movement of the magnetic field; a second member (4) which is connected to the first member (3) and the field device (6), so that the magnetic field is moved relative to the electronic circuit when the first member is moved; a connecting member (8) for connecting the electrical circuit (70) with an external control circuit; and a molded body (5), for holding the electronic circuit (70) and the connecting member (8) with a resinous material, a resin holder (10) including a housing (13) is arranged in the resinous material to the in inside the housing (13) located, electronic circuit (70) from heat and mechanical stress to isolate, which are generated when the molded body (5) is formed.