Fuel reforming catalyst

A fuel reforming catalyst comprising an inorganic porous support, a catalytically active species, and catalyst particles including CeO2 and ZrO2,

• wherein count numbers of Lα lines of Zr in the catalyst particles, which are measured by conducting line analysis using an electron probe micro analyzer, satisfy the following relationship:
• 5.5≤C/D≤18, where C denotes an average value of count numbers of Lα lines of Zr in a range of up to 10% of a particle size in a diameter from a particle surface towards a particle center, and D denotes an average value of count numbers of Lα lines of Zr in a range of up to 25% of the particle size in the diameter from the particle center towards the particle surface,
• and
• count numbers of Lα lines of Ce in the catalyst particles, which are measured by conducting line analysis using the electron probe micro analyzer, satisfy the following relationship:
• 0.5≤A/B<5.5, where A denotes an average value of count numbers of Lα lines of Ce in a range of up to 10% of the particle size in the diameter from the particle surface towards the particle center and B denotes an average value of count numbers of Lα lines of Ce in a range of up to 25% of the particle size in the diameter from the particle center towards the particle surface.