Particles for a monolithic refractory are made of a spinet porous sintered body which is represented by a chemical formula of MgAl2O4, wherein pores having a pore size of 0.01 μm or more and less than 0.8 μm occupy 10 vol % or more and 50 vol % or less with respect to a total volume of pores having a pore size of 10 μm or less in the particles, and the particles for a monolithic refractory have grain size distribution in which particles having a particle size of less than 45 μm occupy 60 vol % or less, particles having a particle size of 45 μm or more and less than 100 μm occupy 20 vol % or more and 60 vol % or less, and particles having a particle size of 100 μm or more and 1000 μm or less occupy 10 vol % or more and 50 vol % or less.