Problem to be solved: To provide a cap for a steam and/or high-temperature liquid supply device and a steam and high-temperature liquid supply device capable of enhancing heating efficiency of contents by suppressing scattering of steam or the like to the outside of a container. Solution: A cap 22 is a cap covering a container CO which faces a steam port 17 from which steam is released and/or a hot water port 18 from which hot water is released and is arranged so as to be able to contact and separate with respect to the steam port 17 and/or the hot water port 18, has an opening end 51 a, A connection part 52 for detachably connecting the body 51 to the steam port 17 and/or the hot water port 18, And a control unit that can control Selected drawing: Figure 2

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