A combination of a helium recondensation apparatus and a cryostat which includes a helium tank tightly closed to store coolant helium in liquid and accommodates a cooled object immersed in the coolant helium, the helium recondensation apparatus being connected to the cryostat for recondensing vapor of the coolant helium in the helium tank, and comprising: a freezer located away from the cryostat and including a main cooling part kept at a very low temperature; and a helium recondensing unit for recondensing the coolant helium in the helium tank by receiving cold energy from the main cooling part of the freezer, wherein the helium recondensing unit includes: a first heat exchanger located above a liquid surface of the coolant helium in the helium tank, and having a first inner space separated from the coolant helium in the helium tank for storing heat-exchanging helium in liquid, the first heat exchanger taking heat of vaporization for evaporation of the heat-exchanging helium in the inner space, from the vapor of the coolant helium in the helium tank; a first recondensing chamber located away from the cryostat but in thermally contact with the main cooling part, and configured to receive vapor of the heat-exchanging helium in the first inner space, recondense and liquefy the received vapor of the heat-exchanging helium by receiving the cold energy from the main cooling part, and discharge the recondensed and liquefied heat-exchanging helium; a support mechanism which supports the first recondensing chamber so that the first recondensing chamber is at a higher position than the helium tank; and a first connection part (27, 28) continuously extending downward from the first recondensing chamber to the first heat exchanger located in the cryostat to define a flow passage for permitting the heat-exchanging helium to flow between the first recondensing chamber and the first heat exchanger so that the heat-exchanging helium discharged from the first recondensing chamber flows to the first inner space of the first heat exchanger by gravity. a freezer located away from the cryostat and including a main cooling part kept at a very low temperature; and a helium recondensing unit for recondensing the coolant helium in the helium tank by receiving cold energy from the main cooling part of the freezer, wherein the helium recondensing unit includes: a first heat exchanger located above a liquid surface of the coolant helium in the helium tank, and having a first inner space separated from the coolant helium in the helium tank for storing heat-exchanging helium in liquid, the first heat exchanger taking heat of vaporization for evaporation of the heat-exchanging helium in the inner space, from the vapor of the coolant helium in the helium tank; a first recondensing chamber located away from the cryostat but in thermally contact with the main cooling part, and configured to receive vapor of the heat-exchanging helium in the first inner space, recondense and liquefy the received vapor of the heat-exchanging helium by receiving the cold energy from the main cooling part, and discharge the recondensed and liquefied heat-exchanging helium; a support mechanism which supports the first recondensing chamber so that the first recondensing chamber is at a higher position than the helium tank; and a first connection part (27, 28) continuously extending downward from the first recondensing chamber to the first heat exchanger located in the cryostat to define a flow passage for permitting the heat-exchanging helium to flow between the first recondensing chamber and the first heat exchanger so that the heat-exchanging helium discharged from the first recondensing chamber flows to the first inner space of the first heat exchanger by gravity. a first heat exchanger located above a liquid surface of the coolant helium in the helium tank, and having a first inner space separated from the coolant helium in the helium tank for storing heat-exchanging helium in liquid, the first heat exchanger taking heat of vaporization for evaporation of the heat-exchanging helium in the inner space, from the vapor of the coolant helium in the helium tank; a first recondensing chamber located away from the cryostat but in thermally contact with the main cooling part, and configured to receive vapor of the heat-exchanging helium in the first inner space, recondense and liquefy the received vapor of the heat-exchanging helium by receiving the cold energy from the main cooling part, and discharge the recondensed and liquefied heat-exchanging helium; a support mechanism which supports the first recondensing chamber so that the first recondensing chamber is at a higher position than the helium tank; and a first connection part (27, 28) continuously extending downward from the first recondensing chamber to the first heat exchanger located in the cryostat to define a flow passage for permitting the heat-exchanging helium to flow between the first recondensing chamber and the first heat exchanger so that the heat-exchanging helium discharged from the first recondensing chamber flows to the first inner space of the first heat exchanger by gravity.