NOVELTY - A reaction apparatus (10) comprises low temperature reaction part (14), high temperature reaction part (15) which reacts at high temperature rather than low temperature reaction part, connection part which connects low temperature reaction part and high temperature reaction part, and thermally-conductive component in which one end part is equipped with low temperature reaction part so that heat conduction and contacting/separating are possible and other end part is equipped with high temperature reaction part so that heat conduction is possible.    USE - Reaction apparatus.    ADVANTAGE - The apparatus suppresses decline of efficiency.    DETAILED DESCRIPTION - A reaction apparatus (10) comprises low temperature reaction part (14), high temperature reaction part (15) which reacts at high temperature rather than low temperature reaction part, connection part which connects low temperature reaction part and high temperature reaction part, and thermally-conductive component in which one end part is equipped with low temperature reaction part so that heat conduction and contacting/separating are possible and other end part is equipped with high temperature reaction part so that heat conduction is possible. The part of thermally-conductive component where low temperature reaction part is equipped is first position, and part of thermally-conductive component where high temperature reaction part is equipped is second position. The one end part of thermally-conductive component spaces from first position when temperature of high temperature reaction part is lower than predetermined temperature of 1. The one end part of thermally-conductive component contacts with first position when temperature of high temperature reaction part is more than predetermined temperature of 1. INDEPENDENT CLAIMS are included for:    (1) a thermally-conductive component; and    (2) a control part of reaction apparatus.    DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of reaction apparatus equipped with fuel cell apparatus.    Reaction apparatus (10)    Reaction apparatus main body (11)    Heat insulation container (12)    Low temperature reaction part (14)    High temperature reaction part (15)