Provided is a two-component mixing container in which a communication passage may be formed between a partition wall member and a second-component containing member without the need for a high processing precision and a high assembly precision. A columnar portion provided at the central portion of a second bottom wall portion of a partition wall member and a circular through hole provided in the central portion of a third bottom wall portion of a second-component containing member are fitted. A first communication passage and a second communication passage are communicated with each other, using a fitting surface formed between the columnar portion and the circular through hole.