| abstract |
Disclosed is a photochromic chromene compound which is a compound (formula (1)) having an indeno(2,1-f)naphtho(1,2-b)pyran structure as a basic skeleton, wherein the structure has an aryl group or heteroaryl group (R 1 group) bonded to the 6-position carbon atom and has, bonded to the 7-position carbon atom, an electron-donating group (R 2 group) having a Hammett number δp of -0.1 or smaller. |