A construction vehicle tire, in which a temperature rise at the tread portion is suppressed by enhancing the heat radiation property at the tire center portion (C). Lug grooves (22) are arranged in the tread shoulder regions (S) on both sides in the tire width direction. The tire center portion (C) is formed with narrow grooves (24) extending substantially in the tire width direction (V) and having both ends terminating within the tread. A deep equatorial groove (26) extends in the tire circumferential direction on the tire equatorial plane (CL), and has a maximum depth within the range of from 70% to 110% of the depth of the lug grooves (22), so as to efficiently cool the bottom region (26B) of the deep equatorial groove (26) at high temperature.