本研究ノートは、市区別平均所得、地震危険度(建物倒壊危険度・火災危険度)を用いて、東京都の市区別の地震保険付帯率・地震保険加入率の決定メカニズムについて分析した。主に以下の結果が得られた。(1)高所得者層ほど地震保険加入率が高い、(2)危険度の異なる地域間でクロス・サブシディゼーション(cross-subsidization)が生じている、(3)地震危険度が高い地域において地震保険加入率が高く、家計の方の災害意識がある程度高い。, In this research note, we analyze the mechanism behind Tokyo residents’ earthquake insurance purchase decision by means of average household income data and earthquake risk indices. The main results are (1) there is a positive relationship between the earthquake insurance participation rate and average household income, (2) cross-subsidization occurs between areas with different earthquake risk index values, and (3) the earthquake insurance participation rate is high in areas where earthquake risk index values are high, implying household earthquake awareness is relatively high.