An anti-Acanthamoeba agent contains luliconazole crystal as an active ingredient. The luliconazole has a crystal habit in which a ratio of I (20-2) to a total sum of I (001), I (100), I (10-1), I (011), I (110), I (11-1), I (10-2), I (11-2), I (020), I (021), I (20-2), I (121), I (013), I (11-3), and I (221) is 12% or more and/or a ratio of I (10-2) to a total sum of I (001), I (100), I (10-1), I (011), I (110), I (11-1), I (10-2), I (11-2), I (020), I (021), I (20-2), I (121), I (013), I (11-3), and I (221) is 20% or more.