diff --git a/service/src/main/kotlin/com/sangdol/roomescape/order/business/OrderValidator.kt b/service/src/main/kotlin/com/sangdol/roomescape/order/business/OrderValidator.kt
new file mode 100644
index 00000000..e475f260
--- /dev/null
+++ b/service/src/main/kotlin/com/sangdol/roomescape/order/business/OrderValidator.kt
@@ -0,0 +1,76 @@
+package com.sangdol.roomescape.order.business
+
+import com.sangdol.common.utils.KoreaDateTime
+import com.sangdol.roomescape.order.exception.OrderErrorCode
+import com.sangdol.roomescape.order.exception.OrderException
+import com.sangdol.roomescape.order.infrastructure.persistence.PaymentAttemptRepository
+import com.sangdol.roomescape.reservation.dto.ReservationStateResponse
+import com.sangdol.roomescape.reservation.infrastructure.persistence.ReservationStatus
+import com.sangdol.roomescape.schedule.dto.ScheduleStateResponse
+import com.sangdol.roomescape.schedule.infrastructure.persistence.ScheduleStatus
+import io.github.oshai.kotlinlogging.KLogger
+import io.github.oshai.kotlinlogging.KotlinLogging
+import org.springframework.stereotype.Component
+import java.time.Instant
+import java.time.LocalDateTime
+
+private val log: KLogger = KotlinLogging.logger {}
+
+@Component
+class OrderValidator(
+    private val paymentAttemptRepository: PaymentAttemptRepository
+) {
+    fun validateCanConfirm(
+        reservation: ReservationStateResponse,
+        schedule: ScheduleStateResponse
+    ) {
+        if (paymentAttemptRepository.isSuccessAttemptExists(reservation.id)) {
+            log.info { "[validateCanConfirm] 이미 결제 완료된 예약: id=${reservation.id}" }
+            throw OrderException(OrderErrorCode.BOOKING_ALREADY_COMPLETED)
+        }
+
+        validateReservationStatus(reservation)
+        validateScheduleStatus(schedule)
+    }
+
+    private fun validateReservationStatus(reservation: ReservationStateResponse) {
+        when (reservation.status) {
+            ReservationStatus.CONFIRMED -> {
+                log.info { "[validateCanConfirm] 이미 확정된 예약: id=${reservation.id}" }
+                throw OrderException(OrderErrorCode.BOOKING_ALREADY_COMPLETED)
+            }
+            ReservationStatus.EXPIRED -> {
+                log.info { "[validateCanConfirm] 만료된 예약 예약: id=${reservation.id}" }
+                throw OrderException(OrderErrorCode.EXPIRED_RESERVATION)
+            }
+            ReservationStatus.CANCELED -> {
+                log.info { "[validateCanConfirm] 취소된 예약 예약: id=${reservation.id}" }
+                throw OrderException(OrderErrorCode.CANCELED_RESERVATION)
+            }
+            ReservationStatus.PENDING -> {
+                val pendingExpiredAt = reservation.createdAt.plusSeconds(5 * 60)
+                val now = Instant.now()
+
+                if (now.isAfter(pendingExpiredAt)) {
+                    log.info { "[validateCanConfirm] Pending 예약 시간 내 미결제로 인한 실패: id=${reservation.id}, expiredAt=${pendingExpiredAt}, now=${now}" }
+                    throw OrderException(OrderErrorCode.BOOKING_PAYMENT_TIMEOUT)
+                }
+            }
+            else -> {}
+        }
+    }
+
+    private fun validateScheduleStatus(schedule: ScheduleStateResponse) {
+        if (schedule.status != ScheduleStatus.HOLD) {
+            log.info { "[validateScheduleStatus] 일정 상태 오류: status=${schedule.status}" }
+            throw OrderException(OrderErrorCode.EXPIRED_RESERVATION)
+        }
+
+        val scheduleDateTime = LocalDateTime.of(schedule.date, schedule.startFrom)
+        val nowDateTime = KoreaDateTime.now()
+        if (scheduleDateTime.isBefore(nowDateTime)) {
+            log.info { "[validateScheduleStatus] 과거 시간인 일정으로 인한 실패: scheduleDateTime=${scheduleDateTime}(KST), now=${nowDateTime}(KST)" }
+            throw OrderException(OrderErrorCode.PAST_SCHEDULE)
+        }
+    }
+}