A thermoelectric conversion element has a substrate and thermoelectric converters. The thermoelectric converters are disposed on the substrate. The thermoelectric conversion element satisfies a requirement (I) below, a requirement (II) below, or both the requirements (I) and (II) below. (I) A value t.sub.d/?.sub.d obtained by dividing a thickness t.sub.d of the thermoelectric conversion element in a thickness direction of the substrate by a thermal conductivity ?.sub.d of the thermoelectric conversion element in the thickness direction of the substrate is 9?10.sup.?4 m.sup.2KW.sup.?1 or less. (II) A value EI/W.sub.d obtained by dividing a flexural rigidity EI of the thermoelectric conversion element by a width W.sub.d of the thermoelectric conversion element is 3?10.sup.?6 Pa.Math.m.sup.4/mm or less.

A thermoelectric conversion element has a substrate and thermoelectric converters. The thermoelectric converters are disposed on the substrate. The thermoelectric conversion element satisfies a requirement (I) below, a requirement (II) below, or both the requirements (I) and (II) below. (I) A value t.sub.d/?.sub.d obtained by dividing a thickness t.sub.d of the thermoelectric conversion element in a thickness direction of the substrate by a thermal conductivity ?.sub.d of the thermoelectric conversion element in the thickness direction of the substrate is 9?10.sup.?4 m.sup.2KW.sup.?1 or less. (II) A value EI/W.sub.d obtained by dividing a flexural rigidity EI of the thermoelectric conversion element by a width W.sub.d of the thermoelectric conversion element is 3?10.sup.?6 Pa.Math.m.sup.4/mm or less.

A thermoelectric conversion element includes a substrate and magnetic bodies. The magnetic bodies are disposed on the substrate and have ferromagnetism or antiferromagnetism. The magnetic bodies have an internal stress of 900 MPa or less.

A thermoelectric conversion element includes a substrate and magnetic bodies. The magnetic bodies are disposed on the substrate and have ferromagnetism or antiferromagnetism. The magnetic bodies have an internal stress of 900 MPa or less.

A thermoelectric conversion element includes a substrate and magnetic bodies. The magnetic bodies are disposed on the substrate and have ferromagnetism or antiferromagnetism. A ratio of a measured density of the magnetic bodies to a theoretical density of the magnetic bodies is 0.80 or more.

A thermoelectric conversion element includes a substrate and magnetic bodies. The magnetic bodies are disposed on the substrate and have ferromagnetism or antiferromagnetism. A ratio of a measured density of the magnetic bodies to a theoretical density of the magnetic bodies is 0.80 or more.

A magnetic heat power generation device; a magnetic heat power generation unit comprises two main supports that are correspondingly connected, and comprises a rotor, a stator and a heating and cooling device; the rotor comprises an annular support; even-numbered groups of hard magnetic fixing grooves are formed on each of two sides of the annular support; a plurality of magnet locking plates in one-to-one correspondence to the hard magnetic fixing grooves is disposed on the annular support; connection portions of one supporting beam and the main supports are provided with adjusting grooves; mounting brackets are disposed on the adjusting grooves; the mounting brackets are provided with stationary retention magnets; a heat insulation plate is disposed on each of two sides of the connection portion of a mounting plate and a transfer arm of the heating and cooling device.

A thermoelectric conversion element includes: a magnetic body having a magnetization; and an electromotive body formed of material exhibiting a spin orbit coupling and jointed to the magnetic body. The magnetic body has an upper joint surface jointed to the electromotive body. The upper joint surface has concavities and convexities.

A wasted heat harvesting device for harvesting electricity including a switching device configured to convey a magnetic field from a first region to at least a second region when the temperature of the switching device crosses a predetermined temperature.

A wasted heat harvesting device for harvesting electricity including switching means configured to convey a magnetic field from a first region to at least a second region when the temperature of the switching means crosses a predetermined temperature.