Eccentric oscillation gear device

An eccentric oscillation gear device that converts rotation frequency between a first member and a second member at a predetermined rotation frequency ratio and transfers a drive force, comprising:

• a crank shaft that includes an eccentric portion and rotates by drive force received from an input portion;
• an oscillation gear that includes an insertion hole, into which the eccentric portion is inserted, and teeth;
• a first cylinder that can be mounted on one of the first member and the second member;
• and
• a second cylinder that can be mounted on the other of the first member and the second member, wherein
• one of the first cylinder and the second cylinder rotatably supports the crank shaft, and the other of the first cylinder and the second cylinder has teeth that engage with the teeth of the oscillation gear,
• the first cylinder and the second cylinder can concentrically rotate relative to each other by oscillation of the oscillation gear due to rotation of the crank shaft, and
• the eccentric oscillation gear device includes a storage unit which stores at least one type of information out of:
• information on a parameter that originates from a processing error and influences rotation angle characteristics;
• information on a parameter that changes depending on temperature and influences rotation angle characteristics;
• and information on a parameter that influences time-dependent change characteristics and influences rotation angle characteristics.