Power transmission device

A power transmission device that transmits a rotational driving force outputted from a driving source to a target device to be driven, the power transmission device comprising:

• a driving rotor rotated by the rotational driving force;
• a driven rotor rotated with a rotary shaft of the target device;
• an electromagnet that generates an electromagnetic force connecting the driven rotor and the driving rotor;
• and
• a buffer member that dampens a shock caused when the driven rotor and the driving rotor are connected to each other, wherein:
• the drive rotor has
• an armature connected to the driving rotor by the electromagnetic force, and
• a plate that applies a load to the armature in an axial direction of the rotary shaft,
• the armature has a driven-side through hole passing through the armature in an axial direction of the rotary shaft;
• the plate has a plate-side through hole passing through the plate in the axial direction of the rotary shaft;
• and
• the buffer member has an overlapping portion disposed overlapping with the driven-side through hole when viewed in the axial direction of the rotary shaft in a state where the overlapping portion extends over an entire region of the plate-side through hole and covers the plate-side through hole.