The positive electrode active material particles, as well as positive and all-solid battery using the same

In the manufacturing process of the battery, reaction suppression layer formed on the surface of positive electrode active material is not easily peeled off, as well as positive and all-solid battery using the same. The present invention provides a positive electrode active material particles for all-solid battery comprising a sulfide-based solid electrolyte, a collection electrode active material particles containing two or more particles, the surface of the aggregate, sulfide the reaction suppression layer for suppressing the reaction between the solid electrolyte is coated, as a cathode active material particles.