PURPOSE: To provide a water jet propulsive boat wherein reducing a cost is attained by eliminating a bulkhead also to facilitate arranging an exhaust pipe and cables further to attain improving workability of inspecting an engine and inspecting a power transmitting system, water jet propeller, etc.

CONSTITUTION: In a water jet propulsive boat 1 constituting a ship body 2 by connecting a hull 3 and a deck 4, mounting an engine 10 in this ship body 2, and transmitting an output of this engine 10 through a power transmitting system 13 to a water jet propeller 16 to drive it, a mounting bracket 22 is mounted on the ship bottom of the hull 3, to journal the power transmitting system 13 through a bearing 25 to this mounting bracket 22.