A hair treatment device can be used with a blower for drying and styling hair. The hair treatment device includes a hair-drying hood for covering the head of a user, which has an opening at a top portion or a side portion thereof. The blower can be inserted from the opening. The hair-drying hood further includes an outer layer, where the opening is disposed, and a thermal layer, which forms an air flow guiding chamber together with the outer layer inbetween for introducing and dispersing hot air from the blower all over the hair-drying hood while raising a temperature of the thermal layer. The hair treatment device further includes a position retainer having a first end fixing the blower, and having a second end is stably fixed onto an object.