Rotation angle detecting device and rotary drive unit by use thereof

A rotation angle detecting device for detecting a rotation angle of a detection object, the device comprising:

• a plate-shaped first integrated circuit (IC) package that is disposed near a rotation axis of the detection object to be rotatable relative to the detection object and that includes a first magnetism detecting element configured to output a signal in accordance with intensity of a magnetic field therearound;
• a plate-shaped second IC package that is provided to be stacked with the first IC package in a thickness direction thereof and that includes a second magnetism detecting element configured to output a signal in accordance with intensity of a magnetic field therearound;
• a power source wire that includes a first power source part and a second power source part on one end side of the power source wire, and a power supply terminal on the other end side of the power source wire, wherein:
• the first power source part is connected to a power source part of the first IC package;
• the second power source part is connected to a power source part of the second IC package;
• and
• the power supply terminal is connected to an external power source;
• a ground wire that includes a first ground part and a second ground part on one end side of the ground wire, and a ground terminal on the other end side of the ground wire, wherein:
• the first ground part is connected to a ground part of the first IC package;
• the second ground part is connected to a ground part of the second IC package;
• and
• the ground terminal is connected to an external ground;
• a first signal output wire that includes a first signal output part at one end of the first signal output wire and a first signal output terminal at the other end of the first signal output wire, wherein:
• the first signal output part is connected to a signal output part of the first IC package;
• the signal from the first magnetism detecting element is outputted to the signal output part of the first IC package;
• and
• the first signal output terminal is configured to output the signal from the first magnetism detecting element to outside;
• and
• a second signal output wire that includes a second signal output part at one end of the second signal output wire and a second signal output terminal at the other end of the second signal output wire, wherein:
• the second signal output part is connected to a signal output part of the second IC package;
• the signal from the second magnetism detecting element is outputted to the signal output part of the second IC package;
• the second signal output terminal is configured to output the signal from the second magnetism detecting element to the outside;
• and
• the power source wire, the ground wire, the first signal output wire, and the second signal output wire are arranged such that at least one of the power supply terminal and the ground terminal is located between the first signal output terminal and the second signal output terminal.