The crash happened on Winton-Lorneville Highway (State Highway 6), about 150m north of the Makarewa Bridge, on September 2 last year.
Matthew Dale Harris (22) and his daughter Ruby Jane Harris (five months) died. Four other people were injured.
Wilson Prasidh Narayan (46) a labourer, pleaded guilty to six charges when he appeared at the Invercargill District Court this morning.
They were: two counts of careless or inconsiderate vehicle operation causing death, two counts of careless or inconsiderate vehicle operations causing injury, one count of carless driving and a charge of careless driving related to another incident on October 16, 2020.
Narayan will be sentenced on March 9.