Taphophobia
(重定向自Taphephobia)

Fear of being buried alive is the fear of being placed in a grave while still alive as a result of being incorrectly pronounced dead. The abnormal, psychopathological version of this fear is referred to as taphophobia (from Greek τάφος - taphos, "grave, tomb" and φόβος - phobos, "fear"), which is translated as "fear of graves".