A side vehicle-body structure for a vehicle, the side vehicle-body structure comprising: a rear door having a center pillar extending in a vehicle up-down direction built in a front portion of the rear door; a front door having a door impact bar extending in a vehicle front-rear direction built in the front door; and a side sill disposed so as to overlap at least partially with a lower portion of the center pillar in a vehicle side view in a door-closed state along a lower edge of a door opening formed as an opening in a vehicle body side portion so as to be closable by the rear door and the front door, wherein a rear end of the door impact bar is disposed so as to overlap at least partially with the center pillar in the vehicle side view, wherein the front door includes a door inner to which a rear end of the door impact bar is connected, and a connection reinforcement member that is configured to be interposed between the rear end of the door impact bar and the door inner and is configured to reinforce a connection section between the rear end of the door impact bar and the door inner, characterized in that a reinforcement gusset that is configured to connect a lower portion of the front door and a rear portion of the door impact bar to each other is included in an inner portion of the front door, and the side sill is at least adjacently disposed below a connecting portion of the lower portion of the front door at which the lower portion of the front door is connected to the reinforcement gusset, wherein the reinforcement gusset is provided such that an upper end side thereof is positioned at least partially on a vehicle outer side with respect to a lower end side thereof, wherein the door inner includes the lower portion of the front door to which the reinforcement gusset is connected, and in that the connection reinforcement member is extended to a connecting section of the lower portion of the front door at which the lower portion of the front door is connected to the reinforcement gusset. a rear door having a center pillar extending in a vehicle up-down direction built in a front portion of the rear door; a front door having a door impact bar extending in a vehicle front-rear direction built in the front door; and a side sill disposed so as to overlap at least partially with a lower portion of the center pillar in a vehicle side view in a door-closed state along a lower edge of a door opening formed as an opening in a vehicle body side portion so as to be closable by the rear door and the front door, wherein a rear end of the door impact bar is disposed so as to overlap at least partially with the center pillar in the vehicle side view, wherein the front door includes a door inner to which a rear end of the door impact bar is connected, and a connection reinforcement member that is configured to be interposed between the rear end of the door impact bar and the door inner and is configured to reinforce a connection section between the rear end of the door impact bar and the door inner, characterized in that a reinforcement gusset that is configured to connect a lower portion of the front door and a rear portion of the door impact bar to each other is included in an inner portion of the front door, and the side sill is at least adjacently disposed below a connecting portion of the lower portion of the front door at which the lower portion of the front door is connected to the reinforcement gusset, wherein the reinforcement gusset is provided such that an upper end side thereof is positioned at least partially on a vehicle outer side with respect to a lower end side thereof, wherein the door inner includes the lower portion of the front door to which the reinforcement gusset is connected, and in that the connection reinforcement member is extended to a connecting section of the lower portion of the front door at which the lower portion of the front door is connected to the reinforcement gusset.