A transmission method for transmitting a first transmission signal from one or more first outputs and a second transmission signal from one or more second outputs that differ from the first outputs, the first and the second transmission signal being generated by using one of a plurality of precoding matrices to precode a first and a second modulated signal modulated in accordance with a modulation method, the first and the second modulated signal being composed of an in-phase component and a quadrature-phase component, the precoding matrix used to generate the first and the second transmission signal being regularly switched to another one of the precoding matrices, the transmission method comprising the steps of: for a first symbol that is a data symbol used to transmit data of the first modulated signal and a second symbol that is a data symbol used to transmit data of the second modulated signal, when a first time and a first frequency at which the first symbol is to be precoded and transmitted match a second time and a second frequency at which the second symbol is to be precoded and transmitted, two third symbols adjacent to the first symbol in the frequency domain are both data symbols, and two fourth symbols adjacent to the first symbol in the time domain are both data symbols, generating the first transmission signal by precoding the first symbol, the two third symbols, and the two fourth symbols, the first symbol being precoded with a different precoding matrix than each of the two third symbols and the two fourth symbols; generating the second transmission signal by precoding the second symbol, two fifth symbols adjacent to the second symbol in the frequency domain, and two sixth symbols adjacent to the second symbol in the time domain each with the same precoding matrix used to precode a symbol at a matching time and frequency among the first symbol, the two third symbols, and the two fourth symbols; outputting the generated first transmission signal from the one or more first outputs; and outputting the generated second transmission signal from the one or more second outputs. for a first symbol that is a data symbol used to transmit data of the first modulated signal and a second symbol that is a data symbol used to transmit data of the second modulated signal, when a first time and a first frequency at which the first symbol is to be precoded and transmitted match a second time and a second frequency at which the second symbol is to be precoded and transmitted, two third symbols adjacent to the first symbol in the frequency domain are both data symbols, and two fourth symbols adjacent to the first symbol in the time domain are both data symbols, generating the first transmission signal by precoding the first symbol, the two third symbols, and the two fourth symbols, the first symbol being precoded with a different precoding matrix than each of the two third symbols and the two fourth symbols; generating the second transmission signal by precoding the second symbol, two fifth symbols adjacent to the second symbol in the frequency domain, and two sixth symbols adjacent to the second symbol in the time domain each with the same precoding matrix used to precode a symbol at a matching time and frequency among the first symbol, the two third symbols, and the two fourth symbols; outputting the generated first transmission signal from the one or more first outputs; and outputting the generated second transmission signal from the one or more second outputs.