To provide a helmet for construction work making the front oblique upper direction and oblique left and right directions easily visible and raising the safety of work.

This helmet for construction work is characterized by composing a visor and parts in the oblique upper direction and oblique left and right directions in the vicinity of the visor in the whole helmet of a light-transmitting material and providing a visibility enlarging area. The helmet is preferably composed so as to prepare the whole of the helmet from the light-transmitting material and provide a light-nontransmitting layer on the front surface or the back surface of the helmet except the visibility enlarging area. The light- nontransmitting layer is preferably formed of each of light-nontransmitting coatings, plastic sheets, foamed plastic sheets, nonwoven fabrics, etc. A light- transmission inhibitor is preferably compounded in the light-transmitting material or a part in the oblique upper direction and oblique left and right directions in the front side part in a state of the helmet worn in the reversely directed state of the front and rear may be notched to provide the visibility enlarging area and a band for wearing the helmet may be composed so as to be mounted avoiding the visibility enlarging area.