Thermistor

1. A thermistor comprising:

a thermistor element body;

first and second electrodes arranged on the thermistor element body;

a first lead wire an end of which is connected to the first electrode;

a second lead wire an end of which is connected to the second electrode;

a sealing portion of glass which seals at least the thermistor element body, the first and second electrodes, and the ends of the first and second lead wires; and

an insulating portion of an electrically insulating material which covers portions of the first and second lead wires exposed from the sealing portion,

wherein the first and second lead wires are spaced from each other and include respective first portions extending from said ends and spaced from each other with a first space, respective second portions spaced from each other with a second space larger than the first space, and respective third portions spaced from each other with a space varying from the first space to the second space, between the first and second portions, and

wherein the insulating portion covers the first portions of the first and second lead wires together and covers the second and third portions of the first and second lead wires independently for each of the first and second lead wires.

2. The thermistor according to claim 1 , wherein a plurality of bumps are arranged on a surface of the insulating portion.

3. The thermistor according to claim 2 , wherein the insulating portion and the plurality of bumps are comprised of resin.