Driving source assembly

A driving source assembly comprising:

• a prime mover including a driving shaft;
• a continuously variable transmission including a CVT structure and a CVT case and lined up with respect to the prime mover in a predetermined arrangement direction, the CVT structure changing rotational speed of rotational power input from the driving shaft, the CVT case defining a main accommodating space accommodating the CVT structure;
• a first gear that is between the prime mover and the CVT case and rotates together with the driving shaft;
• a second gear that is meshable with the first gear;
• an energy converter including a rotating shaft that rotates in association with the second gear;
• a plate which includes a first surface and a second surface and is fixed to the prime mover and to which the energy converter is fixed, the first surface being opposed to the prime mover and the energy converter, the second surface being opposed to the CVT case;
• and
• a seal, wherein:
• a side of the continuously variable transmission which is close to the prime mover in the arrangement direction is referred to as a first side;
• a side of the continuously variable transmission which is far from the prime mover in the arrangement direction is referred to as a second side;
• the first gear is between the plate and the CVT case;
• the CVT case includes a recess that defines an auxiliary accommodating space accommodating the first gear and is open toward the first side in the arrangement direction;
• the plate closes an opening of the recess from the first side in the arrangement direction;
• and
• the seal surrounds the opening and is between the recess and the plate.