A tilt and trim device for an outboard motor includes a tilt cylinder and a trim cylinder arranged to raise and lower the outboard motor, a reserve tank, an oil route arranged to allow the tilt cylinder to communicate with the reserve tank, and a branch oil route branched from the oil route and arranged to communicate with the trim cylinder. At least one hydraulic pressure adjustment mechanism is arranged to adjust the hydraulic pressure applied to the trim cylinder via the branch oil route to be equal to or lower than a pressure resistance of the trim cylinder when the outboard motor is forcibly lowered by an external force from a tilt range in which the outboard motor is raised or lowered only by the tilt cylinder. The tilt and trim device is operative to prevent deformation of and damage to a trim cylinder by suppressing the hydraulic pressure applied to the trim cylinder to be not greater than a specified pressure value even when the outboard motor is rapidly lowered from a tilt range, and a high hydraulic pressure from the tilt cylinder is returned in the direction of the trim cylinder.