▎ 摘　　要

NOVELTY - A carbon-type solid acid comprises carbonaceous material which has a sulfonic acid group, and has graphene structure in at least a portion and contains boron. USE - Carbon-type solid acid used in solid acid catalyst (claimed) used as acidic catalyst for chemical reactions e.g. esterification, hydrolysis, alkylation, dehydration of alcohol and hydration of olefin. ADVANTAGE - The carbon-type solid acid has improved handleability and high catalytic activity even when used repeatedly. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of carbon-type solid acid, which involves mixing carbonaceous material precursor and a boron-containing compound, heating the obtained boron-containing carbonaceous material precursor, carbonizing at least one portion of the boron-containing carbonaceous material precursor, mixing the obtained boron-containing carbonaceous material with concentrated sulfuric acid, fuming sulfuric acid or sulfur trioxide, and introducing sulfonic acid group.