An electrical connection unit includes a bus bar and a base member. The base member has an accommodation portion in which at least a part of the bus bar is accommodated, and has an insulating property. The electrical connection unit is provided with a holding structure. The holding structure includes at least either of a plurality of protrusions protruding from an inner surface of the accommodation portion toward the bus bar and a plurality of protrusions protruding from a surface of the bus bar toward the inner surface of the accommodation portion. The holding structure holds the bus bar with respect to the accommodation portion in a state in which a gap is formed between the inner surface of the accommodation portion and the bus bar.

An electrical connection unit includes a bus bar and a base member. The base member has an accommodation portion in which at least a part of the bus bar is accommodated, and has an insulating property. The electrical connection unit is provided with a holding structure. The holding structure includes at least either of a plurality of protrusions protruding from an inner surface of the accommodation portion toward the bus bar and a plurality of protrusions protruding from a surface of the bus bar toward the inner surface of the accommodation portion. The holding structure holds the bus bar with respect to the accommodation portion in a state in which a gap is formed between the inner surface of the accommodation portion and the bus bar.