Provided are a structured catalyst for steam reforming capable of favorably maintaining catalytic activity by suppressing aggregation of catalyst particles and efficiently producing reformed gas containing hydrogen from a reforming raw material containing hydrocarbon, and a reforming apparatus using the same. The structured catalyst for steam reforming (1) of the present invention is used for producing reformed gas containing hydrogen from a reforming raw material containing hydrocarbon, and includes a support (10) having a porous structure constituted of a zeolite-type compound, and at least one catalytic substance (20) present inside the support. The support (10) includes channels (11) connecting with each other, and the catalytic substance (20) is metal nanoparticles and present at least in the channels (11) of the support (10).