To provide a Cu—Ni—Si based rolled copper alloy having excellent strength, electric conductivity and fatigue properties, disclosed is a Cu—Ni—Si based rolled copper alloy, comprising: a total amount of 3.0 to 4.5% by mass of at least one or more selected from the group consisting of Ni and Co, 0.6 to 1.0% by mass of Si, and the balance Cu and inevitable impurities, wherein a 0.2% yield strength YS in a direction transverse to rolling direction is 1040 MPa or more.